MK3.9

<p><strong>MK4 to MK4S upgrade <br /></strong></p>
<p>The current lead time is <strong>1 week </strong>for both xLCD versions.</p>
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<td style="width: 29.0798%; height: 28.375px; border-style: dotted; border-width: 1px; text-align: left;">Order week</td>
<td style="width: 29.2017%; height: 28.375px; border-style: dotted; border-width: 1px; text-align: left;">Order date</td>
<td style="width: 41.7185%; height: 28.375px; border-style: dotted; border-width: 1px; text-align: left;">Shipping estimate</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 33.25px;">Week 33</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 33.25px;">starts August 12, 2024</td>
<td style="width: 41.7185%; height: 33.25px; border-style: dotted; border-width: 1px; text-align: left;" rowspan="7">Already shipped</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 24.7344px;">Week 34</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 24.7344px;">starts August 19, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 24.7344px;">Week 35</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 24.7344px;">starts August 26, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 24.7344px;">Week 36</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 24.7344px;">starts September 2, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 27px;">Week 37</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 27px;">starts September 9, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 30px;">Week 38</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 30px;">starts September 16, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 27px;">Week 39</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 27px;">starts September 23, 2024</td>
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<tr style="height: 27px;">
<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 27px;">Week 40</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 27px;">starts September 30, 2024</td>
<td style="width: 41.7185%; height: 101.203px; border-style: dotted; border-width: 1px; text-align: left;" rowspan="8">Currently shipping</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">Week 41</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">starts October 7, 2024</td>
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<tr style="height: 21px;">
<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">Week 42</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">starts October 14, 2024</td>
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<tr style="height: 21px;">
<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">Week 43</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">starts October 21, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">Week 44</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left; height: 21px;">starts October 28, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left;">Week 45</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left;">starts November 4, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left;">Week 46</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left;">starts November 11, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left;">Week 47</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left;">starts November 18, 2024</td>
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<td style="width: 29.0798%; border-style: dotted; border-width: 1px; text-align: left;">Week 48</td>
<td style="width: 29.2017%; border-style: dotted; border-width: 1px; text-align: left;">starts November 25, 2024</td>
<td style="width: 41.7185%; border-style: dotted; border-width: 1px; text-align: left;">From week 49 (starts December 2)</td>
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<p></p>
<p> </p>
<h3><span style="font-size: 20px;">Current lead time estimates for new orders</span></h3>
<p><span style="color: #e67e23;"><strong>Updated: November 28th, 2024 </strong></span></p>
<p><em>The dates are only an estimation at the date of update, specified above, and rely on the actual</em> production. <em>We're doing our best but please be aware that it can shift for the lead time products. We will update here and on the product pages accordingly.</em></p>
<p>The lead time estimate applies to standalone products, other products in the order may increase the lead time.</p>
<p>If you've ordered a product in a bundle, the lead time of the order is set based on the product in the bundle with the longest lead time.</p>
<p> </p>
<p></p>
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<h4>Product</h4>
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<td style="height: 60.875px; width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center;">
<h4>Lead time</h4>
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<p><strong>MK4 to MK4S upgrade<br /></strong>/MK4S upgrade for versions with old xLCD</p>
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<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>1 week</strong></p>
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<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>MK3S/+ to MK4S upgrade</strong></p>
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<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>1 week</strong></p>
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<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>Original Prusa MMU3 upgrade kit (for MK4S/MK3.9S)</strong></p>
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<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>In stock</strong></p>
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<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>MMU3 assembled unit (for MK4S/MK3.9S) </strong></p>
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<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>In stock</strong></p>
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<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 49px;">
<p><strong>Original Prusa MMU2S to MMU3 upgrade<br />for MK4S/MK3.9S</strong></p>
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<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 49px;">
<p><strong>In stock</strong></p>
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<p>You can find your order shipping date in the order detail section in our shop.</p>
<div class="note-callout">All products purchased in our <a href="https://shop.prusa3d.com/">online store</a> are currently being shipped from the<strong> Czech Republic, </strong>a member state of the <strong>European Union, customs charges may apply for shipments to countries outside of the EU!</strong> Please see our advisory article <a href="http://help.prusa3d.com/article/vat-value-added-tax-customs-fees_1505#orders-outside-eu">here</a>.</div>

Shipping information

Infill patterns

<div class="warning-callout">This is an&nbsp;<strong>advanced calibration</strong>, recommended only to&nbsp;<strong>experienced users</strong>.</div>
<p>The Extrusion Multiplier allows the fine-tuning of the extrusion flow rate - simply described as&nbsp;<strong>how much filament comes out of the nozzle</strong>. In other words, the&nbsp;<strong>Extrusion Multiplier</strong>&nbsp;setting in PrusaSlicer and the&nbsp;<strong>Flow rate</strong>&nbsp;setting in printer firmware are two ways to adjust the same thing, however, adjusting one of those two settings will not influence the value of the other.</p>
<p><strong>This procedure is not necessary with a new printer coming from the factory</strong>, but rather applies for specific applications and filaments. The ideal value is different for every type of material and every color. It can even differ from spool to spool. Bear this in mind if you change type and brand of filament often or use cheap no-name brands.</p>
<div class="note-callout">Total flow rate = <strong>Flow multiplier</strong> in firmware (M221) x <strong>Extrusion multiplier</strong> in PrusaSlicer. For those interested in diving deeper, PrusaSlicer uses the same <a href="https://manual.slic3r.org/advanced/flow-math">Flow math as Slic3r</a>.</div>
<h3><strong>How to spot an issue</strong></h3>
<p>This calibration is used to fix two common problems:</p>
<ul>
<li><strong>Overextrusion</strong> - Too much material is extruded (flow is too high). It causes scarring of bottom layers and unnecessary material buildup on top layers.</li>
<li><strong>Minor under extrusion</strong>&nbsp;- Not enough material is extruded (flow is too low). It causes small gaps that appear between layer lines or perimeters.</li>
</ul>
<p><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-600x282.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-800x376.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-300x141.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-768x361.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-1536x721.jpg 1536w" alt="" width="852" height="400"></p>
<p><strong>Overextrusion</strong> is a common problem with many filament brands. It's especially problematic when you're trying to glue two parts of the model. <strong>If the top layer is over extruded, you'll end up with an uneven surface that will prevent a seamless connection between the two pieces.</strong></p>
<h3><strong>How to do the calibration</strong></h3>
<p>In PrusaSlicer, navigate to <span class="key">Filament Settings</span> and look for Extrusion Multiplier. The default setting (for PLA) is 1, this value represents a percentage, 1 = 100%, 0.95 = 95% etc. Usually, the adjusted values can be between 0.9 and 1.1. To adjust it, simply rewrite the value.</p>
<p><img decoding="async" style="max-height: 200px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/image-2019-1-15-12-55-6.png" data-hd-height="200px"></p>
<p>In the printer menu, during a print, go to the Tune menu and then choose Flow. Again, the usual values can range between 90 and 110, although that does not mean you can't go above or below that.</p>
<h4>Which method should I use?</h4>
<p>There are two methods you can use to calibrate the Extrusion Multiplier, and we'll cover both of them in this article:</p>
<ul>
<li><strong>Precise Method</strong>&nbsp; -&nbsp; using precision tools such as calipers or micrometers.</li>
<li><strong>Visual Method&nbsp;</strong>&nbsp;- an easy method based on observing the visual properties of your models.</li>
</ul>
<p>The choice of the method depends entirely on your preferences; in the end, both yield similar results. Even the visual method will enable you to have perfectly fitting parts with smooth &amp; flat top layers.</p>
<h4>Precise Method</h4>
<div class="note-callout">Please note that the following guide is based on <strong>default</strong> PrusaSlicer 0.4 nozzle profiles, with a layer height of 0.1mm - 0.2mm. This means that:<br />
- Nozzle size = 0.4<br />
- Extrusion width =&nbsp;0.45<br />
- Basic materials (PLA, ABS, PETG) Extrusion Multiplier = 1<br />
<strong>If you wish to calibrate the printer with a bigger/smaller nozzle or layer heights above 0.2, then you will need to adjust these values as well.</strong></div>
<ol>
<li>Download the <a href="https://cdn.help.prusa3d.com/wp-content/uploads/2021/04/cube-40-40-40.zip">Precision Method Cube STL</a>.</li>
<li>Slice it using the Vase Mode and your most-often used layer height and print it. You can find Vase mode (Print Settings →&nbsp; Layers and perimeters →&nbsp; Spiral vase).</li>
<li>Make three or more measurements in the middle of each wall and calculate the overall average thickness.</li>
<li>Calculate the extrusion multiplier using the following formula: <strong>Extrusion multiplier = (Extrusion width (0.45) / Average measured wall thickness)</strong>.</li>
<li>Adjust the Extrusion Multiplier in Filament Settings → Filament</li>
<li>Re-print the cube with new settings and go back to step 3 if necessary.</li>
</ol>
<p><img decoding="async" style="max-height: 220px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/micrometer-small-jpg.JPG" height="400" data-hd-height="220px"></p>
<div class="warning-callout">Please note that cheap digital calipers may not be accurate enough to make reliable measurements of a single perimeter wall.</div>
<h4>Visual Method</h4>
<p>This method does not require any tools, only your sight. The point is to make sure your top layers are <strong>smooth</strong>, <strong>shiny,</strong> and without <strong>scarring or filament buildup</strong> near the perimeters.</p>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/destiky6.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-600x374.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-800x499.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-300x187.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-768x479.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-1536x958.jpg 1536w" alt="" width="641" height="400"></p>
<ol>
<li>Download the <a href="https://cdn.help.prusa3d.com/wp-content/uploads/2021/04/visual-method-cube.zip">Visual Method Cube.stl</a></li>
<li>Slice it using the default Prusa PLA presets at 0.20mm layer height and print it.</li>
<li>Inspect the top layer of your cube visually and with the tip of the finger.</li>
<li>If the top is under extruded or not smooth, then re-adjust the Extrusion Multiplier accordingly by 1-2%.</li>
<li>Repeat the steps above as long as needed.</li>
</ol>
<p>If there is&nbsp;<strong>too much material</strong>&nbsp;near the perimeters,&nbsp;<strong>decrease</strong>&nbsp;the Extrusion Multiplier value.</p>
<p><img decoding="async" style="max-height: 390px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/buildu.jpg" data-hd-height="390px" data-hd-align="left"></p>
<p>If there are&nbsp;<strong>visible gaps</strong>&nbsp;between layer lines,&nbsp;<strong>increase</strong> the Extrusion Multiplier value. (Microscopic gaps near the perimeters are OK.)</p>
<p><img decoding="async" style="max-height: 430px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/gaps.jpg" data-hd-height="430px" data-hd-align="left"></p>


Extrusion multiplier calibration

<p>Stringing or oozing, also known as "hairy prints", is the name given for when small strings of filament are left on a printed model. This usually happens when the filament keeps flowing from the nozzle while the extruder is moving to another object. You can see this as a marginal line of filament left between the objects.</p>
<p>This issue is caused by <strong>very high printing temperatures and/or using incorrect retraction settings</strong>. This can be solved by changing a couple of settings in PrusaSlicer and checking your hardware.</p>
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<td style="width: 48.8442%;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-600x383.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-800x511.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-300x192.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-768x490.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-1536x981.jpg 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-2048x1308.jpg 2048w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b.jpg 1600w" alt="" width="400" height="255"></td>
<td style="width: 48.8442%;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-600x400.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-800x534.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-300x200.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-768x512.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00.jpg 1600w" alt="" width="400" height="267"></td>
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</tbody>
</table>
<h3>Stringing from material left on the nozzle</h3>
<p>If you print for a long time from a single type of filament, such as PET-G, the filament can create a thin layer in the nozzle. This can cause stringing as the strands of the filament stick to the surface of the print. Therefore, thoroughly clean the nozzle before printing and make sure that any dirt or remnants of previous filaments are removed from the nozzle.</p>
<div class="warning-callout">We highly recommend using our official (factory default) preset settings in PrusaSlicer. However, if you are printing with your own settings, make sure that you have the retraction settings configured correctly.</div>
<h3>PrusaSlicer settings</h3>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-600x359.jpeg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-800x479.jpeg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-300x179.jpeg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-768x459.jpeg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-1536x919.jpeg 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted.jpeg 1600w" alt="" width="700" height="419"></p>
<p>You should start by checking a parameter known as Retraction. What does retraction do? When the extruder has finished printing one section/object of your g-code, the filament is pulled back into the nozzle. Once the extruder moves to the next location the printing process continues – the filament is pushed back out and it starts extruding from the nozzle again. Retraction settings can be found in PrusaSlicer in <em>Printer Settings -&gt; Extruder 1</em>.</p>
<p>Flexible filaments usually need longer retractions, because the material stretches while being pulled back to the nozzle. Flexible materials are a special case and can need a lot of tweaking and tuning.</p>
<p><strong>The retraction settings are:</strong></p>
<ul>
<li><strong>Retraction length:</strong> Amount that the filament is pulled back when a retraction is triggered. <strong>On the MK2.5/S and MK3/S/+, the retraction length should be a maximum of 2 mm.</strong></li>
</ul>
<div class="tip-callout">Due to the Bowden extruder, the retraction length of the Original Prusa MINI/MINI+ presets are much longer (default 3.2 mm).</div>
<ul>
<li><strong>Lift z:</strong> lifts the extruder during movement. Having this setting lower will improve stringing. Note that disabling this feature may cause the nozzle to hit the printed part.<strong><br /></strong></li>
<li><strong>Retraction Speed:</strong> Extruder motor speed on retraction. A higher value improves stringing, but if it is too high it may skip steps in the motor.</li>
<li><strong>Minimum travel after retraction:</strong> Amount of move that will trigger a retraction (mm). The preset number in PrusaSlicer is 1 mm, which is a low amount. Having this number higher will get lower printing times, but increase oozing and stringing.</li>
<li><strong>Retract on layer change:</strong> Activates retraction when the layer changes to the next one. It is recommended to leave this option on.</li>
<li><strong>Wipe while retracting:</strong> Moves the nozzle (wipe) while the retraction is happening. It is recommended to leave this option on.</li>
<li><strong>Retract amount before wiping:</strong> This option does a quick retract before doing the wiping movement. More suitable for the Original Prusa MINI/MINI+.</li>
</ul>
<p><strong>Other settings that affect retraction:</strong></p>
<ul>
<li><strong>Only retract when crossing perimeters:</strong> <em>(Print settings -&gt; Infill -&gt; Advanced):</em> Disables retraction when the travel path does not exceed the upper layer's perimeter. Any oozing that happens will be within the walls and should be invisible.</li>
<li><strong>Avoid crossing perimeters:</strong> <em>(Print settings -&gt; Layers and perimeters -&gt; Quality):</em> Optimize travel moves in order to minimize the crossing of perimeters. This will lower the stringing amount, especially in the MINI/MINI+.</li>
<li><strong><a href="http://help.prusa3d.com/article/sequential-printing_124589">Sequential printing</a>:</strong> <em>(Print settings -&gt; Output options -&gt; Sequential printing):</em> Printing each object individually has a smaller chance of causing stringing between the parts. When using this feature, PrusaSlicer will warn you of any possibility of the extruder colliding with an already printed part, but follow the print closely.</li>
<li><strong>Nozzle temperature:</strong> <em>(Filament settings -&gt; Filament -&gt; Nozzle):</em> Lowering the temperature decreases the occurrence of strings. Try decreasing the nozzle temperature by 5 – 10°C and check whether there’s less stringing.</li>
</ul>
<h3>Filament</h3>
<p>Try using a different spool than the one that is causing the stringing. The filament might have gathered moisture, which will cause a lot of stringing.</p>
<h3>Hotend</h3>
<p>Stringing in the nozzle might be caused by a heat dissipation issue in the nozzle. Try <a href="http://help.prusa3d.com/guide/how-to-replace-a-heatbreak-heatsink-heaterblock-mk3s-mk3s-mk2-5s-mmu2s_16104">re-applying thermal paste</a> on the threads between the heatbreak and the heatsink.</p>
<p>If you have recently changed any component in the hotend, it is also possible that some individual parts are not in place. Go over the assembly of the hotend and check for any parts that may be different from the <a href="http://help.prusa3d.com/guide/how-to-replace-a-heatbreak-heatsink-heaterblock-mk3s-mk3s-mk2-5s-mmu2s_16104">instructions</a>.</p>
<h3>Enough settings, pass me my <strong>heat-gun!</strong></h3>
<p>If you don’t feel like tweaking any of the settings, well, then there is an alternative. You can get rid of the strings with a heat gun (or often with a lighter – but be very careful). Set your heat-gun to around 200 °C and aim at the strings for one or two seconds. This will melt the strings, and the printed object should remain undamaged. Do not leave the heat source on the printed model for longer than one or two seconds, as this may deform the part.</p>


Stringing and oozing

<div><strong><img decoding="async" loading="lazy" style="float: right;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-768x768.jpg 768w" alt="" width="225" height="225"></strong></div>
<h3>Basic info</h3>
<div><strong>PETG</strong> is one of the most easily printable materials, it is <strong>inexpensive and suitable for beginners</strong>. Relatively high tenacity and temperature resistance make it <strong>suitable for printing technical parts</strong> (for example parts of our printers).</div>
<div>&nbsp;</div>
<div><strong>Recommended nozzle temperature:</strong> 230 °C for the first layer, 240 °C for the other layers</div>
<div>&nbsp;</div>
<div><strong>Recommended bed temperature:</strong> 85 °C for the first layer, 90 °C for the other layers</div>
<div>&nbsp;</div>
<div><strong>Heatbed:</strong> Using powder-coated TXT or satin sheet is highly recommended. Printing on smooth PEI surface might damage the sheet.</div>
<h3>Description</h3>
<div>
<p><a href="https://www.prusa3d.com/category/prusament-petg/"><strong data-stringify-type="bold">PETG</strong></a> (Polyethylene Terephthalate modified with Glycol) is a commonly used technical material, popular among 3D printer users for its <strong>low price and good printability</strong>. It’s tenacious, with good temperature resistance; PETG is most commonly used for printing various mechanical parts, holders, clamps, and waterproof parts (thanks to great layer adhesion).</p>
<p>PETG has a glossy surface, adheres greatly to a print sheet, and <strong>does not shrink or warp</strong> (it has very little thermal expansion), therefore it’s suitable for printing large models. Plus, its high tenacity and flexibility often <strong>prevent it from breaking.</strong> Due to good temperature resistance, PETG parts are suitable both for interior and most exterior use (with temperatures below 80 °C). <strong>Parts of our printers are made of PETG!</strong></p>
<p>The letter G in PETG means that it’s modified with glycol during the manufacturing process. Glycol makes PET less brittle, easier to print, and more transparent for translucent prints. Of course, you can print also with PET filaments without glycol. However, printing with only PET is challenging and does not offer any advantage whatsoever.</p>
<div class="warning-callout">Even though PETG in itself may be considered <a href="http://help.prusa3d.com/article/food-safe-fdm-printing_112313">food-safe</a>, it consists of layers, as every 3D print, in which bacteria can grow over time. You can prevent this by applying a <strong>food-safe(epoxy) coating.</strong> Also, a stainless-steel nozzle should be used for if food is the intended application.</div>
<p>Although <strong>PETG</strong> is frequently used in <strong>food industry</strong> and is considered <strong>food-safe</strong>, we do not recommend it (or any other filament) for printing dishes or other stuff that comes into direct contact with food. The main reason is tiny print layer surface grooves that can support numerous bacterial colonies. But if you still want 3D printed dishes, we suggest <strong>applying a special layer</strong> that seals the surface (food-safe coating) and printing with a clean steel nozzle.</p>
<p>Some of the manufacturers <strong>enrich PETG with various additives</strong> and sell these materials under different names. For example, Spoolworks EDGE by E3D is modified PET/Copolyester Blend with additives. The goal is to acquire better visual qualities, surface and layer adhesion, etc.</p>
<p>To compare supported material properties, see our <a href="https://help.prusa3d.com/en/materials">material table.</a></p>
</div>
<table class="striped">
<tbody>
<tr>
<th>
<p>Pros</p>
</th>
<th>
<p>Cons</p>
</th>
</tr>
<tr>
<td>
<p>✔ Easy to print</p>
</td>
<td>
<p>✖ Possibility of stringing</p>
</td>
</tr>
<tr>
<td>
<p>✔ Good layer adhesion</p>
</td>
<td>
<p>✖ Poor bridging and overhangs</p>
</td>
</tr>
<tr>
<td>
<p>✔ Tough and durable</p>
</td>
<td>
<p>✖ Not great for printing detailed parts</p>
</td>
</tr>
<tr>
<td>
<p>✔ Low warping</p>
</td>
<td>
<p>✖ Bonds strongly to the print surface</p>
</td>
</tr>
<tr>
<td>✔ High temperature-resistance</td>
<td>
<p>✖ Soluble in dangerous chemicals</p>
</td>
</tr>
<tr>
<td>✔ Water and humidity resistant</td>
<td>
<p>✖ Supports are hard to remove</p>
</td>
</tr>
</tbody>
</table>
<h3>Best use</h3>
<p>PETG is used universally but is especially suitable for mechanical parts for both indoor and outdoor use. We use PETG to print parts for our printers! Plastic bottles are also made from this kind of material.</p>
<h3>Tips for successful printing</h3>
<p><strong>Temperature settings and cooling</strong></p>
<p>Unlike PLA, <strong>PETG requires a heated bed (85 °C).</strong> Its bridging- and overhang-behavior is usually worse, plus it is prone to stringing. Stringing can be moderated with higher retractions and lower nozzle temperature, but we suggest <strong>using the PrusaSlicer profiles that should work fine.</strong> It’s important to <strong>cool the PETG print</strong> - this helps to keep the model detailed and prevents stringing and oozing. But if you want the model to be as tough as possible, try to turn off the print fan. Higher filament temperature improves merging between layers which leads to better mechanical resistance. Otherwise, we recommend printing the first few layers with the print fan off to prevent deformation, then with the fan running at half its power.</p>
<div class="warning-callout"><strong>Do not print on the smooth PEI sheet</strong> as the adhesion may be too strong!</div>
<p><strong>Print surface preparation</strong></p>
<p>Make sure the print surface is clean, as described in <a href="http://help.prusa3d.com/article/first-layer-issues_1804">our dedicated article</a>. It is advisable to use one of the <strong>powder-coated print sheets. Do not print on the smooth PEI sheet</strong> as the adhesion may be too strong! If you decide to use the smooth PEI sheet anyway, apply a glue stick on it before printing.</p>
<p><strong>Adding more perimeters for more solid parts</strong></p>
<p>If you want to print truly solid parts, <strong>try to increase the number of perimeters</strong> instead of adding more infill.</p>
<h3>Postprocessing</h3>
<p>PETG can be easily sanded both dry and wet.</p>
<p><strong>Dissolving PETG</strong></p>
<p><strong>Dissolving and smoothing PETG</strong> is possible only in a laboratory by skilled lab workers using <strong>dangerous chemicals</strong> (Dichloromethane).</p>
<h3>Sample prints</h3>
<table style="border-collapse: collapse; width: 100%; height: 954px;" border="0">
<tbody>
<tr style="height: 300px;">
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-768x768.jpg 768w" alt="" width="800" height="800"></td>
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-768x768.jpg 768w" alt="" width="800" height="800"></td>
</tr>
<tr style="height: 18px;">
<td style="width: 48.805%; height: 18px; text-align: center;"><em>MMU (Multi-Material Unit)</em></td>
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Electronics cover and other printer parts</em></td>
</tr>
<tr style="height: 300px;">
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-768x768.jpg 768w" alt="" width="800" height="800"></td>
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-768x768.jpg 768w" alt="" width="800" height="800"></td>
</tr>
<tr style="height: 18px;">
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Ukulele</em></td>
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Various mechanical parts</em></td>
</tr>
<tr style="height: 300px;">
<td style="width: 48.805%; height: 300px; text-align: center;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-768x768.jpg 768w" alt="" width="800" height="800"></td>
<td style="width: 48.805%; height: 300px; text-align: center;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-768x768.jpg 768w" alt="" width="800" height="800"></td>
</tr>
<tr style="height: 18px;">
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Electronic parts</em></td>
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Boxes and organizers</em></td>
</tr>
</tbody>
</table>


PETG

Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade

Assembly manuals

Basic calibration

Advanced calibration

All information you need to know to learn how to calibrate your 3D printer to achieve perfect prints.

Calibration

Printer description

Printer features

FAQs and other useful information you might be interested in before or after making your purchase at shop.prusa3d.com

General Information

Basic overview of your 3D printer and it's features, plus general Prusa Research info.

About your printer

3D models

Material guide

Printer maintenance

Prusa Connect & PrusaLink

In this section, you can find material guides, printer troubleshooting and general info about using your printer.

Using the printer

Print Quality Troubleshooting

QR Error codes

Printer troubleshooting

Description of how to recognize and solve common problems, especially hardware and electronics related.

Troubleshooting

Nozzles

Octoprint

Learn about different nozzles, Raspberry Pi connection, Octoprint and more.

3rd party accessories & Other projects

About PrusaSlicer

Configuration and profiles

User interface

Input/output

Top toolbar

Print settings

Filament settings

Advanced features

The official documentation for the PrusaSlicer slicing software. From basic configuration to advanced settings like modifier meshes.

PrusaSlicer

1. Introduction

1a. Parts check

1b. Printer disassembly

1c. Parts preparation

2. Frame assembly

3. X-axis & X-carriage assembly

4. Z-axis assembly

5. Nextruder assembly

6. xLCD assembly

7. Y-carriage & Heatbed assembly

8. Preflight check

Manual changelog MK3.9 upgrade

<p>Each Original Prusa printer is shipped with a bundle of sample G-codes. These G-codes are tested and tailored specifically for your printer model and can be used either to see the printer capabilities or for troubleshooting.</p>
<p>Find your printer in the table and download the zip archive. Both the model geometry (.stl/.3mf) and the presliced version (.gcode) are included.</p>
<div class="tip-callout">You can find all the printable parts on our <a href="https://www.printables.com/@Prusa3D/collections/54487">Printables page</a>.</div>
<h2>Original Prusa FFF Series</h2>
<table class="striped" style="width: 100%; height: 594px;">
<tbody>
<tr style="height: 18px;">
<td style="width: 33.1288%; height: 18px; text-align: left;"><strong>Printer model</strong></td>
<td style="width: 16.9325%; text-align: left; height: 18px;"><strong>Printer type</strong></td>
<td style="width: 25.0307%; height: 18px; text-align: left;"><strong>3D models</strong></td>
<td style="width: 25.0307%; text-align: left;"><strong>G-codes</strong></td>
</tr>
<tr>
<td style="width: 33.1288%;">MK4S/MK3.9S</td>
<td style="width: 16.9325%;">FFF</td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4S-MK39S-3dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4S-MK3.9S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 18px;">
<td style="width: 33.1288%; height: 18px;">MK4/MK3.9</td>
<td style="width: 16.9325%; height: 18px;">FFF</td>
<td style="width: 25.0307%; height: 18px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4-MK39-3dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4-MK39-gcodes.zip">link</a>*</td>
</tr>
<tr>
<td style="width: 33.1288%;">MK3.5/S</td>
<td style="width: 16.9325%;">FFF</td>
<td style="width: 25.0307%;">TBA</td>
<td style="width: 25.0307%;">TBA</td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MK3S+</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3family-3dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MK3-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MK3S</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3family-3dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MK3-gcodes.zip">link</a></td>
</tr>
<tr style="height: 18px;">
<td style="width: 33.1288%; height: 18px;">MK3</td>
<td style="width: 16.9325%; height: 18px;">FFF</td>
<td style="width: 25.0307%; height: 18px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3family-3dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MK3-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MK2.5S</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;">TBA</td>
<td style="width: 25.0307%;">TBA</td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MK2.5</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;">TBA</td>
<td style="width: 25.0307%;">TBA</td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MINI+</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-gcodes.zip">link</a></td>
</tr>
<tr style="height: 18px;">
<td style="width: 33.1288%; height: 18px;">MINI</td>
<td style="width: 16.9325%; height: 18px;">FFF</td>
<td style="width: 25.0307%; height: 18px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-gcodes.zip">link</a></td>
</tr>
<tr style="height: 18px;">
<td style="width: 33.1288%; height: 18px;">XL 1T</td>
<td style="width: 16.9325%; height: 18px;">FFF</td>
<td style="width: 25.0307%; height: 18px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-1T-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-1T-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">XL 2T</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-2T-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-2T-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">XL 5T</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-5T-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-5T-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU3</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK3S-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK3S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU2S &amp; MK3S/+</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MMU2S-gcodes.zip">link</a></td>
</tr>
<tr>
<td style="width: 33.1288%;">MMU2S &amp; MK2.5S</td>
<td style="width: 16.9325%;">FFF</td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK25S_MMU2S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU2 &amp; MK3</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3_MMU2-gcodes.zip">link</a></td>
</tr>
<tr>
<td style="width: 33.1288%;">MMU2 &amp; MK2.5</td>
<td style="width: 16.9325%;">FFF</td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK25_MMU2-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU1 &amp; MK2</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU1-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK2MMU-gcodes.zip">link</a></td>
</tr>
</tbody>
</table>
<p><em>*The archive includes G-codes for both MK4 and MK3.9 printers. G-codes are sliced for Input Shaper and older non-Input Shaper firmware. To print the Input Shaper G-codes, please make sure your printer is running <a href="https://help.prusa3d.com/downloads">firmware 5.0.0 or newer</a>.</em></p>
<h2>Original Prusa SLA Series</h2>
<table class="striped" style="width: 100%; height: 73px;">
<tbody>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px; text-align: left;"><strong>Printer model</strong></td>
<td style="width: 16.9325%; text-align: left; height: 21px;"><strong>Printer type</strong></td>
<td style="width: 25.0307%; height: 21px; text-align: left;"><strong>3D models</strong></td>
<td style="width: 25.0307%; text-align: left; height: 21px;"><strong>G-codes</strong></td>
</tr>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px;">Original Prusa SL1S</td>
<td style="width: 16.9325%; height: 21px;">MSLA</td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1S-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px;">Original Prusa SL1</td>
<td style="width: 16.9325%; height: 21px;">MSLA</td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1-gcodes.zip">link</a></td>
</tr>
</tbody>
</table>
<h2>Prusa Pro FFF Series</h2>
<table class="striped" style="width: 100%; height: 31px;">
<tbody>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px; text-align: left;"><strong>Printer model</strong></td>
<td style="width: 16.9325%; text-align: left; height: 21px;"><strong>Printer type</strong></td>
<td style="width: 25.0307%; height: 21px; text-align: left;"><strong>3D models</strong></td>
<td style="width: 25.0307%; text-align: left; height: 21px;"><strong>G-codes</strong></td>
</tr>
<tr style="height: 10px;">
<td style="width: 33.1288%; height: 10px;">Prusa Pro HT90</td>
<td style="width: 16.9325%; height: 10px;">FFF</td>
<td style="width: 25.0307%; height: 10px;">TBA</td>
<td style="width: 25.0307%; height: 10px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/HT90-gcodes.zip">link</a></td>
</tr>
</tbody>
</table>
<p> </p>


Sample G-codes

<p>As there are ways of remotely transferring files and starting prints, an SD card or USB flash drive is the most common and reliable way to get your files to your machine. Though common and convenient, flash memory is not the most reliable in itself and your storage can be corrupted or fill up without any obvious signs. Therefore, we have put together a small guide on how to maintain, format, and purchase memory for your Original Prusa printer.</p>
<h3>Make sure your SD card is not locked!</h3>
<p>The SD card has a latch on the side. Before using your SD card, make sure that the latch is not set to the Locked position. In case it is locked, you will not be able to save files on the card, and the printer will not be able to open the SD card.</p>
<p><img decoding="async" style="max-height: 350px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-01.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-01-300x293.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-01-410x400.jpg 410w" data-hd-height="350px" data-hd-align="center"></p>
<h3>Storage over 32 GB</h3>
<p>There is no upper size limit on compatible storage media, but <strong>the built-in Windows formatting tool does not support formatting storage media from a size of 32 GB or more to FAT32.</strong> It will only provide the option for exFAT, which is currently not supported by our printers. There are similar limitations under various versions of Apple's OSx, where a third-party application must be used to format it correctly.</p>
<p>To format such a drive you need a third-party application, like Rufus, FAT32 format, or EaseUS Partition Master. <strong>Be careful when using such programs</strong> so you do not <strong>accidentally format the wrong storage media</strong>, like your hard drive. However, 8-16 GB is more than enough for most use cases, as a G-code file rarely exceeds 100 MB.</p>
<h3>How do I format the USB drive/SD card?</h3>
<p>If your SD card or USB drive is full or if you can't read the content of the drive, but the drive is recognized by windows, most often all you need to do is to format the drive.</p>
<div class="note-callout">If your USB drive or SD card does not even show up in your computer file explorer it is probably corrupted beyond repair, or at least beyond the scale of this article. If you get an error like the one in the picture below and it does not show up anywhere, off to google you go, but you might have to consider this card/USB drive lost and get a new one.</div>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-600x238.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-800x317.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-300x119.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-768x304.jpg 768w" alt="" width="631" height="250"></p>
<h3>How to format on Windows</h3>
<p>On Windows, this is very simple. Locate your USB drive or SD card in my computer, right-click, and choose format.</p>
<p><img decoding="async" style="max-height: 350px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03.png" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-300x288.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-417x400.png 417w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-768x737.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-625x600.png 625w" data-hd-height="350px" data-hd-align="center"></p>
<p>A new small window will pop up. Most of the time you can simply leave everything to default, but the most important thing is that the <strong>File System is set to FAT32.</strong> This and the Volume Label (Name of the drive) is the only thing you want to touch here. Click Start and your drive will be formatted in a matter of seconds.</p>
<div class="warning-callout">Formatting any drive will delete all the content of the drive! Back up your stuff!</div>
<p><img decoding="async" style="max-height: 300px; display: block; margin-left: auto; margin-right: auto;" title="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-04-166x300.png 166w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-04-222x400.png 222w" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-04.png" data-hd-height="300px" data-hd-align="center"></p>
<div class="note-callout">If the USB stick will not work even after this procedure, it is either broken or its "partitioning scheme" is set as GPT, which is incorrect. <strong>It must be set as MBR (Master Boot Record).</strong> For how to change this, please see <a href="https://docs.microsoft.com/en-us/windows-server/storage/disk-management/change-a-gpt-disk-into-an-mbr-disk">Microsoft's official documentation</a>.</div>
<h3>How to format on Mac</h3>
<p>On Mac, it is a few more steps, but still very accessible. Again, you want to choose <strong>FAT32 as your file system</strong>, but you also have the option of changing the "partitioning scheme", which <strong>should always be MBR (Master Boot Record).</strong></p>
<div class="warning-callout">This process deletes all content from the drive.</div>
<ol>
<li>Plug the USB drive or SD card into your Mac.</li>
<li>Go to <em>Applications -&gt; Utilities</em> and launch <em>Disk Utility.</em></li>
<li>Click on the icon in the top-left (<span style="color: #2dc26b;">green arrow</span>) and select "Show All Devices" from the drop-down menu.</li>
</ol>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted.png" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-600x271.png 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-800x361.png 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-300x135.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-768x347.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-1536x693.png 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted.png 1600w" alt="" width="500" height="226"></p>
<p style="text-align: center;"><em>macOS Big Sur 11.6</em></p>
<ol start="4">
<li>Right-click on the USB drive/SD card in the sidebar under "External". <em>Select the top entry for your drive, not a partition located below.</em></li>
<li>Select Erase in the Disk Utility-toolbar (<span style="color: #b96ad9;">purple arrow</span>).</li>
</ol>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted.png" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-600x271.png 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-800x361.png 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-300x135.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-768x347.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-1536x693.png 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted.png 1600w" alt="" width="500" height="226"></p>
<p style="text-align: center;"><em>macOS Big Sur 11.6</em></p>
<ol start="6">
<li>Enter a name for the formatted disk.</li>
<li>Click on the Format menu and choose MS-DOS (FAT).</li>
<li>Make sure the Scheme is set to "Master Boot Record".</li>
</ol>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01.png" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-600x301.png 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-800x401.png 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-300x150.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-768x385.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-1536x771.png 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-2048x1027.png 2048w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01.png 1600w" alt="" width="500" height="251"></p>
<p style="text-align: center;"><em>macOS Big Sur 11.6</em></p>
<ol start="9">
<li>Click Erase.</li>
<li>Your USB drive will now be erased and re-formatted correctly.</li>
</ol>
<div class="tip-callout">If your SD card is not detected by the printer at all, be sure to check out <a href="http://help.prusa3d.com/article/sd-card-not-working_2095">SD card not working</a> for further information.</div>

SD cards and USB drives

<p>The blob (mass of plastic accumulated around the hotend) is one of the most scary-looking printing problems you might face with your 3D printer. Removing it after it happens is quite tricky, though not impossible.</p>
<div class="warning-callout">Please note that damage caused by the blob is <strong>not covered by the warranty</strong> as it is neither hardware nor software related. It can be prevented by properly calibrating the printer as well as by stopping the print as soon as the filament starts to stick to the nozzle.<br />See the <strong>Safety Instructions</strong> on the 3D Printing Handbook bundled with each of our printers. <strong>Do not leave the printer unattended while it's switched on.</strong></div>
<p>We prepared a short video on how to remove an extruder blob. The video features our Original Prusa MK3, but the same principles of heating the filament blob in order to soften it and carefully removing it with pliers <strong>apply to all our FDM printer models.</strong> </p>
<h3>How to clear the extruder blob</h3>
<p style="text-align: center;"><iframe src="https://www.youtube.com/embed/mSmJKjibMT0" width="560" height="315" frameborder="0" allowfullscreen="allowfullscreen" loading="lazy"></iframe></p>
<div class="warning-callout">Before doing anything, please note that the cables of the hotend thermistor and the heater cartridge are most likely entangled in the blob. The heater cartridge cable in particular is very vulnerable as <strong>its insulation ends before the wire enters the cartridge body. </strong></div>
<ol>
<li>Preheat the nozzle in the <em>LCD Menu -&gt; Settings/Control -&gt; Temperature -&gt; Nozzle</em>. The temperature needs to be approximately 30°C higher than the temperature at which the blob has formed. For example, if the blob is made of:
<ul style="list-style-type: square;">
<li><strong>PLA: </strong>preheat to 250<strong>°</strong>C</li>
<li><strong>ABS/PETG:</strong> preheat to 280<strong>°</strong>C</li>
</ul>
</li>
</ol>
<div class="note-callout">On MK3/S/+, it is also possible to preheat the printer through the <em>Preheat</em> menu, but note that a <a href="http://help.prusa3d.com/article/thermal-model-calibration_382488">Thermal anomaly error</a> might happen.</div>
<ol>
<li>If <a href="http://help.prusa3d.com/article/mintemp-error-and-mintemp-bed_2169">MINTEMP</a> or <a href="http://help.prusa3d.com/article/preheat-error_2163">Preheat error</a> message appears on the LCD, it means the thermistor or the heater cable (respectively) is already broken. In this case, your only option is to use a heat gun to heat the plastic. Work very carefully, you don't want to melt the printed parts surrounding the hotend. Clear the blob little by little.</li>
<li>After the hotend reaches the right temperature, leave it this way for at least 5 minutes. <strong><em>Turn the printer off before the next step, or you might cause an electrical short.<br /></em></strong></li>
<li>Smaller blobs will start to fall off by themselves. As for the bigger ones, use a pair of pliers to remove the now soft plastic mass from the hotend carefully. Again, be very cautious around the leads coming from the hot end, in particular, the thermistor leads.<em><strong><br /></strong></em></li>
<li>Once the big chunks of the amassed plastic are removed, use a small brass brush to get rid of what's left (as shown in the video above).</li>
<li>In case you do not succeed, as well as in case the blob has damaged some of the extruder parts, you can find your spare parts <a href="https://shop.prusa3d.com/en/18-spare-parts">here</a>. To see the spare parts section, you have to be logged into the account you used to purchase the printer.</li>
</ol>
<h3><strong>How to prevent this problem from happening</strong></h3>
<p>Unlike the <a href="http://help.prusa3d.com/article/spaghetti-monster_1999">Spaghetti monster</a> issue, the blob issue often occurs early during the print. In general, the blob forms if the first layer detaches from the print surface and sticks to the moving hot nozzle while it keeps extruding, causing the blob to grow.</p>
<p>In order to prevent this situation from happening, bear in mind these simple rules:</p>
<ul>
<li>Always make sure to <strong>clean the print surface</strong> before starting the print. See <a href="http://help.prusa3d.com/article/first-layer-issues_1804"><u>this guide</u></a> for more details.</li>
<li>Take the time to <a href="http://help.prusa3d.com/article/first-layer-calibration-i3_112364"><u>adjust the first layer height</u></a> at the beginning of the print. Make sure that the first layer is sticking properly to the entire print surface.
<div class="tip-callout">This step does not apply to Original Prusa MK4, MK3.9, XL, as they are equipped with <a href="http://help.prusa3d.com/article/loadcell-mk4-s-mk3-9-s-xl_401253">loadcell</a>, although minor first layer adjustment is still possible on these printers. </div>
</li>
<li><strong>Check the print every now and then.</strong> If you observe any potential problem, pause the print and give yourself the time to solve it. As a last resort, you can always stop the print, adjust the settings, and start again.</li>
</ul>
<h3>Silicone sock</h3>
<p>Consider installing a <a href="http://help.prusa3d.com/article/nextruder-silicone-sock-xl-mk4-mk3-9_641415">silicone sock</a>. This is <a href="https://www.prusa3d.com/product/prusa-nextruder-silicone-sock-set/">available in our shop</a> for <strong>MK4/S</strong>, <strong>MK3.9/S</strong>, and <strong>XL</strong>. Although the component does not prevent extruder blobs, in case this occurs, it makes it easier to remove it. </p>


Extruder blob

<p>A clogged nozzle or hotend is a common issue for FFF/FDM printers. If there are no issues, the filament is pushed in the hotend, melted, and then extruded through the nozzle. However, if the nozzle is damaged or there are impurities in the filament it might get stuck in the hotend, clogging the printer.</p>
<h3>How to spot clogged nozzle/hotend?</h3>
<h4>Visual check</h4>
<ul>
<li>Is the filament reaching the nozzle? Check if the filament goes past the Nextruder gear.</li>
<li>Is the filament coming out of the nozzle? Pay attention when loading the filament.</li>
<li>Partial clog - gaps and missing layers</li>
<li>Partial clog - filament curling up and sticking to the nozzle</li>
</ul>
<h4>Soundcheck</h4>
<p>Check if there are clicking noises from the extruder</p>
<ul>
<li>If there is a loud clicking noise, this most likely suggests the nozzle is clogged or deformed </li>
<li>If there is a light clicking noise, this can most likely point to the gearing</li>
</ul>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/81f35c769288a087.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Clogged hotend (XL)" alt="" width="400" height="400" loading="lazy" /></p>
<h4>Partial clog</h4>
<p>Sometimes the clog is partial, meaning that the printer is able to push some filament through, but it is not enough to print the object properly, leading to visible gaps and missing layers. An early sign of a clogged nozzle is that the filament is not extruded consistently, curls up, and sticks to the nozzle.</p>
<h4>Extruder clicking</h4>
<p>The hotend or the nozzle is partially or fully clogged and the internal resistance against the flow of the filament is greater than what the gears are able to push. As a result, the gears are skipping leading to the “clicking” noise and in most scenarios also to the grinding of the filament.</p>
<h3>How to fix the clogged printer? </h3>
<p>Choosing the right method depends on whether <strong>you are able to at least partially load/unload the filament or whether the printer is fully jammed</strong> and refusing the move the filament even a little.</p>
<p>Before you start fixing the printer, try unloading the filament and removing it completely. If you are unable to do it, it might indicate a more serious problem, but we will deal with this one as well.</p>
<p>Also, move the extruder upwards from <em>LCD Menu - Settings - Move Axis - Z-axis</em> or by long-pressing the control knob, this way you will get better access to the parts that are clogged.</p>
<h4>Extruder idler screws</h4>
<p>The extruder includes two idler tension screws, to set the correct distance between the drive gear and the two driven gears. These are set to the optimal position at the factory. In case of an intervention on that part, you can adjust the idler tension screws to their optimal position: the tips of the screws must be aligned with the front surface of the Idler Nut. After that, close the Idler Block.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/XL_Extruder_Open2.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Clogged hotend (FIONA)" alt="" width="600" height="450" loading="lazy" /></p>
<h4>Gears</h4>
<p>Over time, a deposit of filament debris can form in the grooves of the feeding gear, which then causes insufficient filament extrusion. Access the extruder by lifting the Idler Nut, and then moving the Idle Shaft. You can blow away the dirt with compressed air, or use a brass brush or an ordinary toothpick. Use the access hole on the side of the extruder. </p>
<h4>Nozzle </h4>
<div class="warning-callout"><strong>Do not touch the hotend while the printer is at a hot temperature.</strong> <strong>Heated parts can cause severe burns!</strong> </div>
<div>Follow these steps to clean the nozzle: </div>
<ol>
<li> Heat the nozzle to the appropriate temperature according to the filament material you will be printing from. First, introduce the filament, then insert an <strong>acupuncture needle</strong> (included in the package) or a thin wire (0.3-0.35 mm) into the nozzle from below to a depth of approximately 1-2 cm. <strong>Use protective gloves if material suddenly starts to flow from the nozzle</strong>.</li>
<li> Select the Load Filament option from the LCD menu and check that the nozzle is actually pushing the filament.</li>
<li> Insert the wire or acupuncture needle into the nozzle again and repeat the whole procedure several times. If the filament is extruded correctly, the nozzle is clean.</li>
</ol>
<div class="tip-callout">Are you still having issues? Contact our <a href="http://help.prusa3d.com/article/customer-support_2287">support team</a> and let them know that you tried to fix the issue with these instructions. We will take it from there.</div>


Clogged hotend (MK4)

<h3>Why the name spaghetti monster?</h3>
<p>This print issue looks exactly like it sounds, a big mess of "spaghetti" on and around your print<strong>.</strong> It is actually extruded filament, which was misplaced by the print head (extruder) because at a certain point during the print the object below moved or collapsed.</p>
<div class="tip-callout">If the first layer isn’t perfect, the chance of any type of print failure increases.</div>
<h3>The most common reasons</h3>
<ol>
<li>The printed object detaches from the print bed during the print</li>
<li>The printed object collapses during the print</li>
<li>An error within the 3D model and/or the sliced file</li>
</ol>
<p><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/spaghetti-1024-x-577-jpg"></p>
<h3><strong>Troubleshooting</strong></h3>
<ul>
<li><strong>Check the first layer</strong> – Simply make sure that the first layer is sticking properly to the whole print surface. You can refer to <a href="http://help.prusa3d.com/article/first-layer-issues_1804">First layer issues</a>.</li>
<li><strong>Check the object for errors</strong>&nbsp;– Always check the generated G-code in the&nbsp;<strong>Preview</strong>&nbsp;of our&nbsp;<strong>PrusaSlicer</strong>. PrusaSlicer will also display a small warning triangle next to the model should it find any obvious issues. In case you find any gaps or broken geometry, you can either repair the STL object yourself and check our article <a href="http://help.prusa3d.com/article/corrupted-3d-models-for-printing_2205">Corrupted 3D models for printing</a>.</li>
<li><strong>Try to increase the bed temperature</strong> – If you have already experienced this error, try to re-run the print and increase the bed temperature by 5-10 <strong>°</strong>C. This should help with the first layer adhesion. You don’t have to re-slice the object and prepare a new G-code. Just start the print, go to the&nbsp;<em>LCD Menu – Tune – Bed,</em> once the mesh bed leveling is completed<strong>.</strong></li>
</ul>


Spaghetti monster

<p>The <strong>filament sensor</strong> equipped on the <strong>Original Prusa MK4, </strong><strong>Original Prusa MK3.9, and each tool of Original Prusa XL</strong> detects the presence of a filament and filament run-out. The sensor is a Hall sensor, triggered by a mechanism composed of a spring, a magnet, and a ball. </p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/06/961d724774263fdc78c6b50694c1bede_painted.jpeg" alt="" width="500" height="375" loading="lazy" /></p>
<h3>Check assembly</h3>
<p>If your printer is a kit, you have received a package with magnets for the <a href="http://help.prusa3d.com/guide/5-nextruder-assembly_434014">assembly</a>. Note that two magnets are sent, but one is meant to be used in the assembly, and the other is a spare. If your filament sensor does not work, check if two magnets have not been added by accident.</p>
<table style="border-collapse: collapse; width: 100.026%; height: 20.8px;" border="0">
<tbody>
<tr style="height: 20.8px;">
<td style="width: 48.7906%; height: 20.8px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/ce79d19c2b7f073247216deb1a06d29b.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4, MK3.9, XL)" alt="" width="400" height="300" /></td>
<td style="width: 48.7906%; height: 20.8px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/e5fa0bc557e7822ea3d544fda40735da.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4, MK3.9, XL)" alt="" width="400" height="300" /></td>
</tr>
</tbody>
</table>
<h3>How to clean the filament sensor</h3>
<p>During usage, filament residue might build up around the sensor or its mechanism, possibly causing false readings and thus malfunctioning.</p>
<h4>1) Compressed air</h4>
<p>At the top of the extruder is a small hole, insert the tip of a compressed air can in the hole. With your free hand, prepare a bit of filament with a non-stringy tip. Repeatedly insert and remove the filament from the extruder, while blowing the compressed air. This will dislodge the build-up debris.</p>
<p style="text-align: center;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/08/5ac2eee63621ff1e9030242fe03fa27c.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="500" height="376" loading="lazy" /><em>Top view of the MK4 print head. The XL print head has a similarly positioned small hole.</em> </p>
<h4>2) Filament tip insertion</h4>
<p>In case you don't have compressed air at hand, a similar procedure to the one above can be attempted.</p>
<p>Prepare a bit of filament with a non-stringy tip. Repeatedly insert and remove the filament from the extruder. It will be necessary to insert and remove the bit of filament several times to achieve good cleaning, and the technique might not always be effective. </p>
<h4>3) Removing the sensor (MK4, MK3.9)</h4>
<div class="warning-callout"><strong>The following procedure is NOT recommended on Original Prusa XL</strong>. If you are experiencing issues with the tool filament sensor readings, and the previous methods did not work, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">technical support</a>, and we will guide you through the procedure in more detail. </div>
<div class="tip-callout">Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl?_gl=1*1d00bdg*_ga*MTA4NDA4MDUzNi4xNjg0NTIwNjY3*_ga_3HK7B7RT5V*MTY5MjM1ODUwNC4yNTYuMS4xNjkyMzY0ODI0LjQ5LjAuMA..">PG-assembly-adapter printed with MK4</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl?_gl=1*1d00bdg*_ga*MTA4NDA4MDUzNi4xNjg0NTIwNjY3*_ga_3HK7B7RT5V*MTY5MjM1ODUwNC4yNTYuMS4xNjkyMzY0ODI0LjQ5LjAuMA..">PG-assembly-adapter printed with MK3/S/+</a></div>
<p>If the previous techniques do not work, the filament sensor can be removed to be manually cleaned. This procedure requires partial disassembly of the E-axis. </p>
<ol>
<li>Unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece.</li>
</ol>
<table style="border-collapse: collapse; width: 100.026%;" border="0">
<tbody>
<tr>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="400" height="300" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>Remove the <span style="color: #b96ad9;"><strong>Prusa-ball-holder</strong></span> using pliers.</li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/996ae1c0879279ce1b6ef35f1a255938_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Carefully remove the ball-magnet-spring combo from the Prusa-ball-holder and clean any debris out of it. Clean also the slot on the heatsink.</li>
</ol>
<table style="border-collapse: collapse; width: 100.026%;" border="0">
<tbody>
<tr>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/f45b4fba6e937fd81675038dcecea760.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/889dc9c32adf0b651409f0322dbaf4bb.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="400" height="300" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="5">
<li>Reassemble the Prusa-ball-holder in the following order: steel ball, magnet, and spring.</li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/3503abc8b32f3010a3353ee5d62941ac_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="6">
<li>Reassemble the block with PG-case, PG-ring, gearbox, and main plate.</li>
</ol>
<div class="tip-callout">In case the disassembled parts in step 6 are not in one block, refer to <a href="http://help.prusa3d.com/guide/5-nextruder-assembly_434014#434652">steps 7-15 of the Nextruder assembly guide, part of the MK4 kit assembly guide</a>. </div>


Filament sensor (MK4, MK3.9, XL)

Prusa Connect &amp; PrusaLink

<h3>What happened? </h3>
<p>During the configuration of <strong>Prusa Connect</strong> on the <strong>Original Prusa MINI/+</strong>, <strong>MK4/S</strong>, <strong>MK3.9/S, MK3.5/S</strong> or <strong>XL</strong> an error on this configuration can occur and the printer shows the message "<strong>Registration to Prusa Connect failed due to: ~</strong>". In place of <strong>~</strong>, a text with more details is shown, from the list below. Depending on the specific shown text, there are different causes and fixes. </p>
<p>Error name: Connect Registration Failed</p>
<p>Error code: #12401 (MINI), #13401 (MK4), #26401 (MK4S), #21401 (MK3.9), #23401 (MK3.5), #17401 (XL)</p>
<h4>DNS error</h4>
<p>The printer wasn't able to resolve the <strong>hostname</strong> of the Prusa Connect server into an IP address. The hostname is a unique label assigned to a device connected to a network. </p>
<ul>
<li>The printer is not connected to the network at all.</li>
<li>In case of a <strong>static</strong> configuration (non-DHCP), the <strong>DNS server</strong> is not configured or configured incorrectly.</li>
<li>The local DNS server is currently not working.</li>
<li>The Connect hostname is reconfigured to some that doesn't exist. For example, this can occur if loading a .ini file with an invalid configuration.</li>
</ul>
<h4>Refused</h4>
<p>It's not possible to reach the server on the network level, hence it is not possible to establish a TCP connection. The system is either not answering at all or actively refuses the connection. </p>
<ul>
<li>The internet connection is not working, or a firewall blocks the communication.</li>
<li>In the case of a <strong>static</strong> configuration (non-DHCP), the <strong>gateway </strong>(typically, this is the IP address of the router) is not configured or configured incorrectly. </li>
<li>The Connect server is under maintenance. </li>
<li>Too many TCP connections are open with the printer, for example in PrusaLink. </li>
</ul>
<h4>TLS error</h4>
<p>This message points to an error doing a <strong>SSL/TLS handshake</strong>. This handshake is the process to create a safe and encrypted connection. </p>
<ul>
<li>Time is not synchronized on the printer (MINI/+). The time synchronization occurs for each internet connection, through the <a href="http://help.prusa3d.com/article/ntp-server-mini_151132">NTP server</a>. It is possible this might take more time than initially expected, or rarely, that there might be issues with the server. </li>
<li>A restrictive firewall (for example but not limited to a corporate proxy firewall) may restrict an automatic access to the NTP server. In that case, it will be necessary to manually allow the printer to access the NTP server.</li>
<li>Something in the path is trying to tamper with the communication, for example but not limited to an attack. </li>
</ul>
<h4>Unauthorized</h4>
<p>The server claims that the printer is not authorized. The printer is not recognized as an Original Prusa. </p>
<h4>Server error</h4>
<p>The server is returning a <strong>500 Internal Server Error</strong> or similar. The issue is on the Connect side, and is expected to be fixed on its own. </p>
<h4>Internal error</h4>
<p>This error is caused by an issue related to the printer firmware. </p>
<h4>Network error</h4>
<p>Similar to the Refused error, but the connection dropped after it was initialized. </p>
<ul>
<li>Glitchy internet connection.</li>
<li>The <strong>latency</strong> to the Connect servers is too high. A geographic location is very far from our Connect servers can contribute to this cause.</li>
<li>The Connect server is temporarily down.</li>
</ul>
<h4>Protocol error</h4>
<p>The response from the server is not recognized.</p>
<ul>
<li>Bug on the server side. This cause is on our side and expected to be fixed on its own. </li>
<li>Too old firmware on the printer and it's no longer supported.</li>
<li>A misconfiguration from the <strong>.ini file</strong> loaded on the printer, connecting to something different than our Connect server.</li>
</ul>
<h3>How to fix it? </h3>
<h4>DNS error, Refused</h4>
<p>Ensure that the printer is connected to the internet. In case of a static (non-DHCP) connection, ensure the correct settings are there, or test a DHCP connection. Also, check the .ini configuration file, and in case, rewrite the file. </p>
<p>If the previous steps didn't fix the issue, attempt a <a href="http://help.prusa3d.com/article/factory-reset-mini_177516">factory reset</a>. </p>
<h4>TLS error</h4>
<p>Reattempt the Connect registration, after the printer is connected to the internet for a few more minutes. </p>
<p>If the previous step didn't fix the issue, double-check your network <strong>firewall</strong>. Some firewalls will need for the NTP server to be allowed manually. The specific steps will depend on your specific firewall, we recommend checking your firewall documentation. </p>
<h4>Unauthorized</h4>
<p>If your printer is not an Original Prusa printer, it cannot use our Prusa Connect service.</p>
<p>In case your printer is an Original Prusa, <a href="http://help.prusa3d.com/article/firmware-updating-mini-mini_124784"> re-flash or update its firmware</a>. </p>
<h4>Server error</h4>
<p>A server error indicates an issue from our side. The issue will be fixed on its own, try registering again to Prusa Connect later. </p>
<h4>Internal error</h4>
<p><a href="http://help.prusa3d.com/article/firmware-updating-mini-mini_124784">Re-flash or update the printer firmware</a>. If this does not solve the issue, take note if the printer might have other issues, even if not directly related. </p>
<h4>Network error</h4>
<p>Ensure that your internet connection is stable and not glitchy. To confirm whether an inconsistent internet connection caused the issue, test another connection, if available, such as a hotspot from your mobile phone. </p>
<h4>Protocol error</h4>
<p>Ensure that the printer is running our latest firmware version. If it is running an old version, update the firmware. Also, check the .ini configuration file, and in case, rewrite the file.</p>


Connect Registration Failed

<p>This guide will help you solve the most common issues with the <a href="http://help.prusa3d.com/article/prusa-connect-and-prusalink-explained_302608">PrusaLink and Prusa Connect</a> on your Original Prusa Printer.</p>
<h3>Original Prusa MK4/S, MK3.9/S, MK3.5/S, XL, MINI/+</h3>
<p><strong>Wi-Fi connection status</strong></p>
<p>For the Original Prusa MK4/S, MK3.9/S, MK3.5/S, XL, MINI+, and MINI models, the Wi-Fi connection status is displayed at the top part of the LCD screen, indicated by an icon:</p>
<ul>
<li><strong>White Icon</strong> (<span style="color: #0000ff;"><strong>blue arrow</strong></span> in the image below): Indicates a successful Wi-Fi connection.</li>
<li><strong>Grey Icon</strong>: Wi-Fi is active but not connected to the access point.</li>
</ul>
<p>For detailed connection status, navigate to <strong>Settings &gt; Network &gt; Wi-Fi &gt; Status</strong> in the menu. (<span style="color: #e67e23;"><strong>orange arrow</strong></span> in the image below) These statuses provide insights into the Wi-Fi connectivity and troubleshooting steps for common issues:</p>
<ul>
<li><strong>Connected</strong>: The printer has successfully connected to the network.</li>
<li><strong>Link down</strong>: The printer is connected to the Wi-Fi access point but hasn't obtained an IP address. This could be due to a weak signal, interference, absence of DHCP server on the network, or similar issues. A short "Down" period might occur as part of the normal connection process, so waiting a bit often resolves this.</li>
<li><strong>No AP</strong>: The printer is not connected to any Wi-Fi access point, possibly due to a weak signal, incorrect credentials, or compatibility issues (e.g., the printer’s ESP Wi-Fi module can only connect to 2.4GHz Wi-Fi, not 5GHz-only access points).</li>
<li><strong>ESP error</strong>: Indicates a communication breakdown between the ESP Wi-Fi module and the printer’s main board, potentially due to an ESP firmware crash or a connection issue. The printer will reboot the ESP module automatically to resolve this. If the error recurs, user intervention may be required, such as replugging or reflashing the ESP.</li>
<li><strong>Gone</strong>: The ESP module is either unplugged or does not have an appropriate firmware installed.</li>
<li><strong>Flash ESP</strong>: The connected ESP module has outdated or incorrect firmware and needs updating / reflashing.<br />Select "Setup Wi-Fi Module" item in the same menu. The printer will automatically re-flash the ESP module firmware as a part of the setup wizard.</li>
</ul>
<h4> </h4>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/02/555e58e4f3b6522b94ec5fdfcc969165_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="PrusaLink Troubleshooting - Review" alt="MK4 / XL Wi-Fi connection status" width="600" height="450" loading="lazy" /></p>
<h4>The browser login does not work</h4>
<p>Attempt the login using another browser, some browsers might have issues with the PrusaLink login. </p>
<h4>The printer does not establish a connection (8+ minutes)</h4>
<p>Double-check the credentials in the prusa_printer_settings.ini file, and load them again in the USB drive. In each field, ensure that there is no space before and after the = character. Having the following special characters as part of the SSID would also cause the connection to not be established, make sure they are not part of the SSID: </p>
<ul>
<li>- (Dash)</li>
<li>_ (Underscore)</li>
<li>' (Apostrophe)</li>
<li>. (Dot)</li>
</ul>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/782027dd534617cf_painted.png" alt="" width="500" height="375" loading="lazy" /></p>
<p> </p>
<p>On the <strong>MINI/+</strong> with firmware version up to 4.4x, the prusa_printer_settings.ini file might show an extra row, ensure that this is not changed (key_mgmt=WPA)</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/05/646e334be3da2dd0_painted.jpeg" alt="" width="500" height="375" loading="lazy" /></p>
<p> </p>
<h3>Original Prusa i3 MK3/S/+, MK2.5/S</h3>
<h4>Bad X-Api-Key</h4>
<p>If <strong>PrusaLink </strong>is selected in PrusaSlicer, it is necessary to enter an <strong>API key</strong>. For PrusaLink 0.7.0 or higher, the API key can be found in Prusa Connect, in the Settings tab, on older versions it is shown during the PrusaLink Wizard. Alternatively, select <strong>HTTP digest</strong> for authentication and add your PrusaLink username and password.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/07/be235d272b70fcd5d86012f40daf4598.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="PrusaLink Troubleshooting" alt="" width="600" height="490" loading="lazy" /></p>
<h4>500 internal server error</h4>
<p>This error is caused by the printer serial number not being written properly on the printer Einsy board EEPROM. The solution is copying the serial number to the Einsy EEPROM, with the following procedure: </p>
<ol>
<li>Connect a power bank, a USB charger, or another source of power (excluding a computer) to the printer USB type B port.</li>
<li>With the printer switched on, press the reset button. </li>
</ol>
<h4>Some options in printer detail are not available</h4>
<ul>
<li>Make sure the printer is online and ready</li>
<li>If you do not see any options at all, make sure you have the correct version 0.6.1 of the PrusaLink SD card image flashed to your RPi. In case of doubt, <a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#222170">download the PrusaLink SD card image again</a>.</li>
</ul>
<h4>“ERR: NO IP” on LCD</h4>
<ul>
<li>Wait for up to 5 minutes, sometimes it shows the IP later.</li>
<li>Make sure you have Wi-Fi within reach and in 2.4 GHz.
<div class="note-callout">5GHz Wi-Fi is not supported.</div>
</li>
<li><a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">Set up the SD card in Pi Imager again</a>, making sure you have the name and password entered correctly in Pi Imager settings.</li>
</ul>
<h4>The IP address is not shown</h4>
<ul>
<li>Make sure the RPi port option in <em>LCD menu -&gt; Settings -&gt; RPi port</em> is ON. </li>
<li>Check that the green LED is on or flashing at the bottom right corner of the RPi.
<div class="warning-callout">If the green LED is not on or flashing, the RPi is not working. Review the soldering of the pins, and make sure the pins are long enough. You can test the Pi by connecting it to USB power, but make sure it is not connected via pins to the Einsy board in that case!</div>
</li>
<li>Check that the SD card can be accessed on your computer. Try a different computer if possible, or <a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">set up the SD card in Pi Imager again</a>.</li>
</ul>
<h4>Credentials cannot be saved on RPi Imager</h4>
<p>Ensure that the network has a password. A network without a password cannot be saved on the RPi Imager.</p>
<h4>White/blank screen after finishing the Wizard</h4>
<p>Make sure you are logged in on <a href="https://connect.prusa3d.com/" target="_blank" rel="noopener">connect.prusa3d.com</a>.</p>
<h4>Forgotten login/password to the Link’s website or printer accidentally removed from Connect</h4>
<p>It will be necessary to go through the wizard again. Remove the prusa_printer_settings.ini file from the folder /home/pi, and <a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">set up the SD card in Pi Imager again</a>.</p>
<h4>Flashing takes a long amount of time (20+ minutes)</h4>
<ul>
<li>Make sure you are using a Class10 micro SD card or better. Slow microSD cards affect the speed of the flashing.</li>
<li>Some computers, especially old ones, may have a slow SD card reader. Try the USB reader, if available.</li>
</ul>
<h4>The wizard is slow (2+ minutes to load the next page)</h4>
<ul>
<li>PrusaLink might be still loading. Wait for a few minutes and try again.</li>
<li>Make sure your computer and your printer are connected to the very same network. For example, if your computer is connected by cable and your printer is connected via WiFi, it can cause this issue.</li>
</ul>
<h4>The LCD shows “Starting PrusaLink” after 5+ minutes (MK3/S/+)</h4>
<ul>
<li>Make sure you are using the latest <a href="https://help.prusa3d.com/downloads" target="_blank" rel="noopener">firmware version</a>.</li>
<li><a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">Set up the SD card in Pi Imager again</a>.</li>
</ul>
<h4>Slow uploading of the G-code to PrusaLink</h4>
<p>The upload speed is limited while printing to prevent slowing down the print.</p>
<h4>The Wizard can’t get the serial number from the printer (Err obtaining SN)</h4>
<p>Make sure you are using the latest <a href="https://help.prusa3d.com/downloads">firmware version</a>. </p>
<div class="tip-callout">Contact our <a href="http://help.prusa3d.com/article/customer-support_2287">Customer Support</a> if the previous step is not solving the issue. </div>
<h4>Error bad token</h4>
<div>This may occur if you use PrusaLink on a different printer than the one it was set up with. In this case, make a fresh PrusaLink installation.</div>
<h4>Err unsupported FW</h4>
<p>Upgrade the printer to the latest firmware.</p>


PrusaLink Troubleshooting

<p>The Original Prusa MK4/S, MK3.9, and XL are equipped with a <a href="http://help.prusa3d.com/article/loadcell-mk4-s-mk3-9-s-xl_401253">loadcell</a>. Thanks to this component, starting from firmware 6.0.0, the printer is able to detect whether the filament is stuck and not moving, for example when the nozzle is clogged. </p>
<p>In case this is detected, the print pauses and the printer shows the message: "<strong>Stuck filament detected. The filament seems to be stuck, please unload it from nextruder and load it again</strong>". </p>
<p>Once the <strong>unload </strong>button is pressed, the printer unloads the filament. After this, the printer prompts filament loading, and resumes the print. </p>
<div class="tip-callout">It is important to note that detecting stuck filament is possible only inside the Nextruder, as pressure builds up from the nozzle to the upper part of the Nextruder. However, if your filament is tangled on the spool, there will be no internal pressure, just outside tension, which the loadcell won't be able to recognize.</div>
<div>Stuck filament detection won't be possible on MK3.5 and MINI/MINI+ as they aren't equipped with the loadcell sensor. </div>
<p style="text-align: center;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/e884e31f8ae9e52017bacbeb8fcd544e.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Stuck filament detection #13101 (MK4) #21101 (MK3.9)" alt="" width="500" height="333" loading="lazy" /><em>Screenshot from the Original Prusa MK4</em></p>


Stuck filament detection #26101 (MK4S) #13101 (MK4) #21101 (MK3.9) #17108 (XL)

<p>If the filament is not loaded into the extruder, yet the printer is trying to pull the filament inside, there might be a hardware problem in some of the extruder components: we will examine the causes and fixes in this article. </p>
<h3>Filament tip</h3>
<p>Ensure that the filament tip is cut at an approximate 45 degrees angle. The printer might struggle to load filament otherwise. </p>
<h3>Retry procedure</h3>
<p>After an attempt at loading filament, the printer will prompt a screen, where it is asked if the filament color is correct. If the filament is not oozing from the nozzle at this stage, push the filament towards the extruder, and after that, select "retry". </p>
<h3>Idler tension screws</h3>
<p>The extruder includes two idler tension screws, to set the correct distance between the drive gear and the two driven gears. These are set to the optimal position at the factory. In case of an intervention on that component, it will be necessary to adjust the idler tension screws to their optimal position: the tips of the screws must be aligned with the front surface of the Idler Nut. After that, close the Idler Block.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/XL_Extruder_Open2.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament not loading (FIONA)" alt="" width="600" height="450" loading="lazy" /></p>
<h3>Clogged hotend</h3>
<p>Follow the instructions on the dedicated article on <a href="http://help.prusa3d.com/article/clogged-hotend-mk4_411823">how to spot and fix a clogged hotend</a>. </p>
<div class="tip-callout">Are you still having issues? Contact our <a href="http://help.prusa3d.com/article/customer-support_2287">support team</a> and let them know that you tried to fix the issue with these instructions. We will take it from there.</div>


Filament not loading (MK4/S, MK3.9/S)

<h3>What happened?</h3>
<p>The Original Prusa MK4S/MK4/MK3.9/MK3.5 displays the message: "<strong>Failed to home the extruder in X-axis, make sure there is no obstacle on X-axis</strong>".</p>
<p>Error name: Homing error X</p>
<p>Error code: #26304 (MK4S) #13304 (MK4) #21304 (MK3.9) #23304 (MK3.5)</p>
<p>The error is most likely caused by a bad movement of the print head along the X-axis. </p>
<h3>How to fix it? </h3>
<h4>X-axis movement</h4>
<p>Make sure there are no obstructions in the path of the X-axis. For example, there might be a piece of filament stuck around the belt, or on a smooth rod, from a previous print.</p>
<h4>X-axis belt tension</h4>
<p>Check the X-axis belt tension and adjust it, following our <a href="http://help.prusa3d.com/article/adjusting-belt-tension-mk4-s-mk3-9-s-mk3-5-s-mk3-s_112380">dedicated article on belt adjustment</a>.</p>
<h4>X-axis motor pulley</h4>
<p>The X-axis motor pulley is attached to the X-axis motor shaft. The motor shaft has one flat side. The pulley has two set screws: ensure that one of the two set screws is aligned with the flat part of the motor shaft. Make sure the other set screw is also tightened, not excessively, and that there is a small space between the pulley and the motor. </p>
<h4>X-carriage assembly</h4>
<p>An over-tightened or loose X-carriage and X-carriage-clip assembly might cause the error. If none of the previous steps resolved the issue, refer to our <a href="http://help.prusa3d.com/guide/3-x-axis-x-carriage-assembly_429986">assembly manual</a> to see the assembly of the X-carriage and X-carriage-clip.</p>
<h4>xBuddy connection</h4>
<p>Check the motor connections on the board. For that, open the four screws that hold the xBuddy box cover. Make sure that the motor connector is not loose, and that the X-axis motor connector has not been accidentally switched with the Y-axis motor or any other motor.</p>
<table style="border-collapse: collapse; width: 100.026%;" border="0">
<tbody>
<tr>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/9769d45d75346583db549d162dbb302b_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Homing error Y #13305 (MK4) #21305 (MK3.9)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/a5df42079c5152c4bb1404adc18106ea.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Homing error Y #13305 (MK4) #21305 (MK3.9)" alt="" width="400" height="300" loading="lazy" /></td>
</tr>
</tbody>
</table>


Homing error X #26304 (MK4S) #13304 (MK4) #21304 (MK3.9) #23304 (MK3.5)

<p>During normal function, your printer saves statistics, calibration data, and personalized settings, even after it is turned off. If you feel like you changed settings that have negatively affected your 3D printer, you can always revert to factory default values and try again. </p>
<div class="note-callout">Doing a factory reset will clear statistics data, like total printing time and filament use.</div>
<h3>How to factory reset</h3>
<p>Factory Reset can be done via <em>LCD Menu -&gt; Settings -&gt; System -&gt; Factory Reset</em>. </p>
<p>Starting firmware 4.6.1 there are two options:</p>
<ul>
<li><strong>Reset Settings &amp; Calibrations</strong> - this option deletes all changes done by the user and reverts the system to its original state. For most of the cases, this is a sufficient method. Technically speaking only the EEPROM with user stored data is deleted. Once, the reset is done, the printer will boot to language selection, followed by the calibration wizard.</li>
<li><strong>Hard reset (USB with FW needed)</strong> - due to the complex partition layout, the firmware stores its settings not only in the EEPROM but also on the XFLASH. In some edge cases, it might be necessary to delete both of these. Once this reset is done, the user must insert a USB drive with <a href="http://help.prusa3d.com/article/how-to-update-firmware-mk4-s-mk3-9-s-mk3-5-s-xl_453086">firmware</a> as some parts of the XFLASH will be created again from scratch.</li>
</ul>
<h3>Flashing firmware</h3>
<p>If you see any inconsistent behavior we recommend also flashing the firmware.</p>
<ul>
<li><a href="http://help.prusa3d.com/article/how-to-update-firmware-mk4-s-mk3-9-s-mk3-5-s-xl_453086">MK4/S, MK3.9/S, MK3.5/S, XL</a></li>
<li><a href="http://help.prusa3d.com/article/firmware-updating-mini-mini_124784">MINI/+</a></li>
</ul>
<p>A factory reset followed by flashing the firmware and recalibrating will resolve most firmware issues you may encounter. </p>


Factory reset (MK4/S, MK3.9/S, MK3.5/S, MINI/+, XL)

<h3>What happened?</h3>
<p>The Original Prusa MK4S/MK4/MK3.9/MK3.5 displays the message: <strong>"Failed to home the Y-axis, make sure there is no obstacle on Y-axis</strong>".</p>
<p>Error name: Homing error Y</p>
<p>Error code: #26305 (MK4S) #13305 (MK4) #21305 (MK3.9) #23305 (MK3.5)</p>
<p>The error is most likely caused by a bad movement of the Y-carriage along the Y-axis.</p>
<h3>How to fix it? </h3>
<h4>Y-axis movement</h4>
<p>Make sure there are no obstructions in the path of the Y-axis. For example, there might be a piece of filament stuck around the belt, or on a smooth rod, from a previous print.</p>
<h4>Y-axis belt tension</h4>
<p>Check the Y-axis belt tension and adjust it, following our <a href="http://help.prusa3d.com/article/adjusting-belt-tension-mk4-s-mk3-9-s-mk3-5-s-mk3-s_112380">dedicated article on belt adjustment</a>.</p>
<h4>Y-axis motor pulley</h4>
<p>The Y-axis motor pulley is attached to the Y-axis motor shaft. The motor shaft has one flat side. The pulley has two set screws, ensure that one of the two set screws is aligned with the flat part of the motor shaft. Make sure the other set screw is also tightened, not excessively, and that there is a small space between the pulley and the motor.</p>
<h4>Y-axis bearings position</h4>
<p>Incorrect positioning of the bearings might cause the error.</p>
<p>On the side of the Y-carriage with one bearing, ensure that the bearing is centered on the bearing clip. Approximately the same piece of bearing should be visible on each side.</p>
<p>On the side of the Y-carriage with two bearings, place the bearings as close to the center of the Y-carriage as possible. Beware, the bearings must not touch the edge of the pocket!</p>
<table style="border-collapse: collapse; width: 100%; height: 21px;" border="0">
<tbody>
<tr style="height: 21px;">
<td style="width: 48.8358%; height: 21px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/06/00caa1b4b7e7f0e52a2652767a228c72_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="USB Port overcurrent #13306 (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%; height: 21px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/06/0f85fe99ce29ae9b2d2b9b17eeb6481d_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="USB Port overcurrent #13306 (FIONA)" alt="" width="399" height="299" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p>If you are correcting the position of the bearings, make sure to keep the correct orientation. The tracks (rows of balls) have to be on the sides.</p>
<table style="border-collapse: collapse; width: 100%; height: 21px;" border="0">
<tbody>
<tr style="height: 21px;">
<td style="width: 48.8358%; height: 21px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/06/072a3e6a00466141e3159d45a529cf33_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="USB Port overcurrent #13306 (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%; height: 21px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/06/6fbbf29a7f039d5a3ab1b2f2ebec8ec0_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="USB Port overcurrent #13306 (FIONA)" alt="" width="399" height="299" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4>xBuddy connection</h4>
<p>Check the motor connections on the board. For that, open the four screws that hold the xBuddy box cover. Make sure that the motor connector is not loose, and that the Y-axis motor connector has not been accidentally switched with the X-axis motor or any other motor.</p>
<table style="border-collapse: collapse; width: 100.026%;" border="0">
<tbody>
<tr>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/9769d45d75346583db549d162dbb302b_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Homing error Y #13305 (MK4) #21305 (MK3.9)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/a5df42079c5152c4bb1404adc18106ea.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Homing error Y #13305 (MK4) #21305 (MK3.9)" alt="" width="400" height="300" loading="lazy" /></td>
</tr>
</tbody>
</table>


Homing error Y #26305 (MK4S) #13305 (MK4) #21305 (MK3.9) #23305 (MK3.5)

<p>Selected Original Prusa printers are equipped with status LEDs located on the lower edge of the LCD screen. Together there are three physical RGB LEDs. The system will change their color and intensity based on the current scenario. The purpose of this system is to provide helpful visual information to the user.</p>
<div class="tip-callout">To ensure the LEDs are visible even from a longer distance. Make sure there is a solid, reflective surface under the front edge of the LCD screen.</div>
<p> </p>
<p><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/a0ba9c14ecc0e9e72b88673c7bd5c4b7.png" sizes="(min-width: 1024px) 820px, 100vw" srcset="Status LED explained" alt="" width="800" height="450" loading="lazy" /></p>
<p> </p>
<h3>Compatible printers:</h3>
<ul>
<li>Original Prusa MK4</li>
<li>Original Prusa XL</li>
</ul>
<h3>There are several pre-defined scenarios for the LEDs:</h3>
<ul>
<li><strong>Successful boot</strong>
<ul>
<li><strong>Scenario:</strong> The boot of the system was assessed as successful.</li>
<li><strong>LED response:</strong> The LEDs will pulse shortly with a <strong>green color.</strong></li>
</ul>
</li>
<li><strong>Warning</strong>
<ul>
<li><strong>Scenario:</strong> The printer requires user interaction and then can continue to print (e.g. planned filament change, filament runout, pause in G-code, MMU requires attention, etc.)</li>
<li><strong>LED response:</strong> The LEDs will pulse in <strong>yellow color</strong>.</li>
</ul>
</li>
<li><strong>Critical error</strong>
<ul>
<li><strong>Scenario:</strong> There is a serious error, and the print job cannot continue. The printer must be fixed in order to work correctly (e.g. Thermal runaway, Preheat error, Max/Min temp, ...)</li>
<li><strong>LED response:</strong> The LEDs will pulse in <strong>red color</strong>.</li>
</ul>
</li>
<li><strong>The print job is in progress</strong>
<ul>
<li><strong>Scenario:</strong> The printer is currently in the progress of printing the selected G-code.</li>
<li><strong>LED response:</strong> The LEDs are switched to <strong>blue color</strong>. </li>
</ul>
</li>
<li><strong>The print job is done</strong>
<ul>
<li><strong>Scenario:</strong> The current print job has finished successfully, the print head is parked and the printer is awaiting the user, to collect the printed object. Please note that the <strong>sheet might be still hot! </strong>Avoid harming yourself<strong> </strong>and also give the surface a few moments to cool down to allow easier detachment of the print.</li>
<li><strong>LED response:</strong> The LEDs are switched to <strong>green color</strong>.</li>
</ul>
</li>
</ul>
<h3>Use-defined LED statuses</h3>
<p>LEDs can be controlled using a G-code M150, you can learn more about it at <a href="https://marlinfw.org/docs/gcode/M150.html">Marlin FW site</a>.</p>


Status LED explained (MK4/XL)

<h3>What happened?</h3>
<p>The printer is showing the message "<strong>Hotend preheat error: Check the print head heater and thermistor wiring for potential damage</strong>"</p>
<p>Error name: Hotend preheat error</p>
<p>Error code: #26202 (MK4S) #13202 (MK4) #21202 (MK3.9)</p>
<p>This error is shown when the printer is unable to heat up the nozzle more than <strong>2 ºC for 20 seconds</strong>. The printer starts a safety feature, which instantly kills the heating process and displays the message on the screen. The printer then waits for the user to inspect all parts and if needed fix the issue.</p>
<h3>How to fix it?</h3>
<p>Make sure that the <strong>ambient temperature</strong> where the printer is is stable, and above <strong>10 ºC</strong>.</p>
<h4>Extruder inspection</h4>
<p>This error can be caused by any damage to the <strong>hotend heater</strong> or the <strong>hotend thermistor</strong>.</p>
<p>Access the LoveBoard and check the <span style="color: #843fa1;"><strong>heater</strong> </span>and <strong><span style="color: #236fa1;">thermistor</span></strong> cables. Make sure that they are connected correctly and that there is no damage along their length.</p>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/4d8068ede1cb7f665960fe46fa065702.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Hotend preheat error #13202 (MK4)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/b1fcbf1f9cc8f479_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Preheat error #13202 (FIONA)" alt="" width="400" /></td>
</tr>
</tbody>
</table>
<h4>xBuddy board inspection</h4>
<p>On the MK4/MK3.9 main board, check if the <a href="http://help.prusa3d.com/article/blown-fuse-mk4-s-mk3-9-s_411666">fuse that protects the extruder</a> is not damaged.</p>
<p>Make sure that the Loveboard main cable is correctly connected to the xBuddy board.</p>
<h4>Multimeter check</h4>
<p>In case you have a multimeter available, use <a href="http://help.prusa3d.com/article/multimeter-usage_2117">this guide</a> to check the resistance on the hotend heater and the hotend thermistor.</p>


Hotend preheat error #26202 (MK4S) #13202 (MK4) #21202 (MK3.9)

<h3>What happened?</h3>
<p>The printer is showing the message <strong>"Check the heatbed heater &amp; thermistor wiring for possible damage."</strong></p>
<p>Error name: Bed preheat error</p>
<p>Error code: #26201 (MK4S) #13201 (MK4) #21201 (MK3.9) #23201 (MK3.5)</p>
<p>This message is shown when, during the preheat, the printer does not increase more than <strong>2 ºC for 20 seconds</strong>. The heating is paused so the issue can be fixed.</p>
<h3>How to fix it?</h3>
<p>Make sure that the <strong>ambient temperature</strong> where the printer is is stable, and above <strong>10 ºC</strong>.</p>
<p>This error can be caused by damage to either the <strong>heatbed thermistor</strong> or the <strong>heatbed power cable</strong>.</p>
<div class="tip-callout">Doing <strong>regular maintenance</strong> on the printer may prevent this type of issue.</div>
<p>On the heatbed, check the following:</p>
<ul>
<li>See if the <strong>thermistor </strong>is firmly seated below the <strong>Golden Kapton tape.</strong></li>
<li>Make sure that the <strong>washer </strong>is screwed above the round cable connector, not below it.</li>
<li>Check if the <strong>M3nN nut</strong> is holding the screw firmly.</li>
<li>Access the xBuddy board. Check the <strong><span style="color: #236fa1;">heatbed power cable</span></strong>, the <strong><span style="color: #2dc26b;">heatbed thermistor</span></strong>, and the <a href="http://help.prusa3d.com/article/blown-fuse-mk4-s-mk3-9-s_411666">fuse that protects the heatbed</a>.</li>
</ul>
<table style="border-collapse: collapse; width: 100%; height: 322.875px;" border="0">
<tbody>
<tr style="height: 301.875px;">
<td style="width: 48.8358%; height: 301.875px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/Heatbedthermistor.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Preheat error #13201 (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%; height: 301.875px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/b219085ec996c508.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Preheat error #13201 (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
</tr>
<tr style="height: 21px;">
<td style="width: 48.8358%; height: 21px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/30e875e9b027e87d.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Preheat error #13201 (FIONA)" alt="" width="400" height="1200" loading="lazy" /></td>
<td style="width: 48.8358%; height: 21px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/77686da340e7e4a3_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Preheat error #13201 (FIONA)" alt="" width="400" /></td>
</tr>
</tbody>
</table>
<p>In case all the items are correct, there might be an internal break in one of the cables. If you do not have a multimeter, it is possible to check the cables using the following test: </p>
<ol>
<li>Use a hairdryer to blow hot air at the heatbed.</li>
<li>While doing that, check if there is any temperature change on the LCD screen.</li>
<li>If there is a positive temperature change it means that the heatbed thermistor is working. In this case, the heater is defective.</li>
<li>If there is no change at all, the heatbed thermistor is defective.</li>
</ol>
<h4>Multimeter check</h4>
<p>In case you have a multimeter available, it is possible to check the resistance of the cables using the <a href="http://help.prusa3d.com/article/multimeter-usage_2117">Multimeter usage</a> guide.</p>


Bed preheat error #26201 (MK4S) #13201 (MK4) #21201 (MK3.9) #23201 (MK3.5)

<h3>What happened? </h3>
<p>The printer is showing the message: "<strong>Failed to home the extruder in Z-axis, make sure the loadcell is working</strong>".</p>
<p>Error name: Homing error Z</p>
<p>Error code: #26301 (MK4S) #13301 (MK4) #21301 (MK3.9)</p>
<h3>How to fix it? </h3>
<div>
<p>A fault in the <strong>Loadcell </strong>can trigger a homing error. Ensure that the printer is fully cooled down, go to <em>LCD Menu - Calibration - Diagnostics - Loadcell Test</em>. When tapping the nozzle, use a hard object for it. This is only to check if the Loadcell is responsive or not.</p>
<p>Make sure that the extruder is not exerting force to pull down the filament. If you are not sure, try to unwind it a small amount on the spool when testing the Z-axis.</p>
<p>In case you have an MMU, Enclosure, or custom setup where the filament is fed to the extruder by a PTFE tube, make sure that the extruder does not have to exert force to pull down the tube.</p>
<p>Check if the trapezoid nut has the correct orientation.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/11/6641b70d816472324ff88cc18c0d2715_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Homing error Z #13301 (MK4) Z #21301 (MK3.9) (review)" alt="" width="400" height="300" loading="lazy" /></p>
<p>If no issues are found, open the side fan and make sure that the thumb screws that hold the heatbreak are not over-tightened. Always tighten these screws by hand, never with a tool.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/5650cc936ba9fcf5c2cd4fa77f56a0dd_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Homing error Z #13301 (MK4) Z #21301 (MK3.9) (review)" alt="" width="400" height="300" loading="lazy" /></p>
<p>Also, try loosening the screws shown in the picture below, and re-tighten them, making sure that they are not over-tightened. After that, go to <em>LCD menu -&gt; Control -&gt; Run full selftest</em>.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/fd9868db5993e185e1aff4b5161634dc_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Homing error Z #13301 (MK4) Z #21301 (MK3.9) (review)" alt="" width="400" height="300" loading="lazy" /></p>
</div>


Homing error Z #26301 (MK4S) #13301 (MK4) #21301 (MK3.9)

<h3>What happened?</h3>
<p>The printer is showing the message <strong>"Check the print head thermistor wiring for possible damage."</strong></p>
<p>Error name: Hotend mintemp error</p>
<p>Error code: #26208 (MK4S) #13208 (MK4) #21208 (MK3.9)</p>
<p>This error is shown when the printer's nozzle temperature drops below <strong>5 ºC</strong> at any point. If this happens during a print, the print will be stopped.</p>
<h3>How to fix it?</h3>
<h4>Extruder inspection</h4>
<p>This error is usually caused by the <strong>hotend thermistor</strong>. </p>
<p>Access the LoveBoard. Check if the thermistor is connected correctly and if there is no damage along the cable length.</p>
<p>If you have a multimeter, it is possible to check the resistance of the cables to verify if they are damaged. For that, use our <a href="http://help.prusa3d.com/article/multimeter-usage_2117">Multimeter usage</a> guide.</p>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/4d8068ede1cb7f665960fe46fa065702.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Hotend mintemp error #13208 (MK4)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/b1fcbf1f9cc8f479_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Maxtemp error #13206 (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4>xBuddy board inspection</h4>
<p>Make sure that the Loveboard main cable is correctly connected to the <strong>xBuddy board</strong>.</p>


Hotend mintemp error #26208 (MK4S) #13208 (MK4) #21208 (MK3.9)

<h3>What happened?</h3>
<p>The Original Prusa MK4/MK3.9/MK3.5 is showing the message: <strong>"Overcurrent detected on xBuddy heatbed port, disconnect the device."</strong></p>
<p>Error name: Heatbed Port Overcurrent</p>
<p>Error code: #26309 (MK4S) #13309 (MK4) #21309 (MK3.9) #23309 (MK3.5)</p>
<p>The error is shown when there is a damaged cable on the <strong>heatbed </strong>or any of its connections.</p>
<h3>How to fix it? </h3>
<p>The most likely cause of this issue is damage to the <strong>heatbed </strong>cable. Check the path between the heatbed and the <strong>xBuddy </strong>board, and see if there are any parts that are broken or pinched.</p>
<p>In case there is no damage, check the cable connection to the heatbed and to the xBuddy board. Try reconnecting the connectors.</p>
<p>In rare cases, this error message can be shown in case of damage to the xBuddy board. So if the cables and connectors are intact, try checking the board for any damage.</p>
<table style="border-collapse: collapse; width: 100%; height: 21px;" border="0">
<tbody>
<tr style="height: 21px;">
<td style="width: 48.8358%; height: 21px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/5bf0be529c827b33.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="USB Port overcurrent #13306 (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%; height: 21px;"> <img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/ca06837a757f0023_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Heatbed Port Overcurrent #13309 (FIONA)" alt="" width="399" height="299" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/a325d581e1a553bd_painted.jpeg" alt="" width="400" height="275" loading="lazy" /></p>


Heatbed Port Overcurrent #26309 (MK4S) #13309 (MK4) #21309 (MK3.9) #23309 (MK3.5)

<h3>What happened?</h3>
<p>The printer is showing the error "<strong>Hotend thermal runaway: Check the print head thermistor wiring for potential damage</strong>".</p>
<p>Error name: Hotend thermal runaway </p>
<p>Error code: #26204 (MK4S) #13204 (MK4) #21204 (MK3.9)</p>
<p>The error will show if the temperature on the nozzle drops by <strong>12 ºC</strong> for an extended period of time. This temperature drop would usually not be an issue, but if the heat is not recovered after <strong>60 seconds</strong> the error will happen. In this case, the printer will stop the heating and display the message on the screen.</p>
<h3>How to fix it? </h3>
<p>Make sure that the <strong>ambient temperature</strong> where the printer is is stable, and above <strong>10 ºC</strong>.</p>
<h4>Extruder inspection</h4>
<p>This error can be caused by any damage to the<strong> hotend heater</strong> or the <strong>hotend thermistor</strong>.</p>
<p>Make sure that the hotend thermistor is inserted in the heater block.</p>
<p>Access the LoveBoard. Check if the heater and the thermistor are connected correctly and if there is no damage along their length.</p>
<p>If you have a multimeter, you can use our <a href="http://help.prusa3d.com/article/multimeter-usage_2117">Multimeter usage</a> guide to check if the cables are damaged.</p>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/4d8068ede1cb7f665960fe46fa065702.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Hotend thermal runaway #13204 (MK4)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/b1fcbf1f9cc8f479_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Thermal runaway #13204 (FIONA)" alt="" width="1600" height="1200" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4>xBuddy board inspection</h4>
<p>On the MK4/MK3.9 main board, check if the <a href="http://help.prusa3d.com/article/blown-fuse-mk4-s-mk3-9-s_411666"> fuse that protects the hotend</a> is not damaged.</p>
<p>Make sure that the Loveboard main cable is correctly connected to the xBuddy board.</p>


Hotend thermal runaway #26204 (MK4S) #13204 (MK4) #21204 (MK3.9)


<ul>
<li>New Arrange tool options</li>



<li>New Cut tool options</li>



<li>Per-symbol text projection on surface</li>



<li>Interlocking of painted areas for MMU printing</li>
</ul>


2.6.1


<ul>
<li>Input Shaper and Pressure Advance</li>



<li>PrusaSlicer 2.6.0 and print profiles</li>



<li>G-code compatibility</li>



<li>Support for MK3.9</li>



<li>Language translations</li>



<li>Bug fixes</li>
</ul>


5.0.0


<p>Updated with instructions for MK3.9 upgrade</p>


1.03


<ul>
<li>Changes to self-test</li>



<li>Extended Connect Wizard</li>



<li>Timeout for G-code M115</li>



<li>Updated bootloader</li>



<li>Fixed bugs</li>
</ul>


5.0.1


<ul>
<li>New SVG support</li>



<li>Binary G-Code (.bgcode) export support + conversion</li>



<li>Arc fitting support </li>
</ul>


2.7.0


<ul>
<li>Printing speed boost with Input Shaper and Pressure Advance (XL and MINI)</li>



<li>Major updates to network code; Instant Printing feature</li>



<li>Major updates to Prusa Connect and network communication</li>



<li>Introducing a new efficient open-source Binary G-code format</li>



<li>New useful pre-print screen for XL Multi-Tool printers</li>



<li>Cancel object directly from the printer’s menu</li>
</ul>


5.1.0


<ul>
<li>Binary G-code settings</li>



<li>Wipe tower weight</li>



<li>Bug fixes</li>
</ul>


2.7.1


<ul>
<li>Sending crash dumps to Tech support</li>



<li>New bootloader 2.3.4</li>



<li>Firmware flashing updated</li>



<li>Bug fixes</li>
</ul>


5.1.2


<ul>
<li>Printer type check on startup</li>
</ul>


5.1.3


<ul>
<li>Improvements to multi-material printing</li>



<li>Vase mode smoothing</li>



<li>Support for 3MF files generated in BambuStudio</li>



<li>Metadata with boundary polygon of each object</li>
</ul>


2.7.3


<ul>
<li>Objects from 3MFs generated by BambuStudio now retain multimaterial painting when loaded</li>



<li>Fixed a bug where downloading files from Printables did not work when enabled in Preferences</li>
</ul>


2.7.4


<ul>
<li>Touch support</li>



<li>Stuck filament detection</li>



<li>Stealth mode</li>



<li>MMU3 support</li>



<li>MMU3 firmware auto-update</li>



<li>Cold Pull</li>



<li>Time Zone settings updated</li>



<li>Improvements by the Prusa community</li>



<li>Bug fixes</li>
</ul>


6.0.0


<ul>
<li>Japanese language support (MK4, MK3.9, MK3.5, XL)</li>



<li>Nozzle cleaning repaired (MK4, MK3.9, XL)</li>



<li>Acceleration limit restored (MK4, MK3.9, MINI)</li>



<li>Stealth mode corrected (MK4, MK3.9, MK3.5, XL)</li>
</ul>


6.0.1


<ul>
<li>Improvements by Prusa community</li>
</ul>


6.0.2


<ul>
<li>Interim solution of USB disconnect issues (MK4, MK3.9, MK3.5, XL)</li>
</ul>


6.0.3


<ul>
<li>Prusa Connect integration</li>



<li>Prusa Account integration</li>



<li>Improved UI</li>



<li>Improved G-code Viewer</li>



<li>New system profile updating system</li>



<li>Single Perimeter for top and bottom layers</li>



<li>Extended SLA layer separation configuration</li>



<li>Bug fixes</li>
</ul>


2.8.0

6.0.4


<ul>
<li>Support for MK3.9S and MK3.5S printers</li>



<li>Numeric keyboard</li>



<li>Custom names for steel sheet</li>



<li>User-configurable hostname</li>



<li>Binary G-code check</li>



<li>ESP firmware flash during boot (MINI, MK3.5/S, MK3.9/S, MK4/S)</li>



<li>New bootloader 2.3.5</li>



<li>Network Status screen</li>



<li>Steel sheet name in footer (MK3.5/S)</li>



<li>Powered Z-motors during calibration procedure (MK3.5/S, MK3.9/S, MK4/S)</li>



<li>Default nozzle diameter set to 0.4 (XL)</li>



<li>Bug fixes</li>
</ul>


6.1.2


<ul>
<li>Issues with numeric keyboard repaired (MK4/S, MK3.9/S, MK3.5/S, XL)</li>



<li>Returned nozzle diameter setup (XL)</li>



<li>Printhead position during calibrations changed (MK4/S, MK3.9/S, MK3.5/S)</li>



<li>Cold pull (XL)</li>
</ul>


6.1.3


<ul>
<li>Improved menu bar, the menu no longer hides under a button</li>



<li>Two new parameters (Abrasive material and High flow nozzle) for G-Code checks</li>



<li>Improved automatic orientation of bridges</li>



<li>Number of bugfixes</li>
</ul>


Original Prusa MK3.9

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