A loose nextruder nozzle is very, very confusing :-).

Material Change during printing

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Flow Confusion

Assembly manuals

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

Calibration

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

About your printer

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

Using the printer

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

Troubleshooting

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

3rd party accessories & Other projects

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

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Basic calibration

<p>The First Layer Calibration is used to calibrate the distance between the tip of the nozzle and the print surface. The aim is to adjust the nozzle height until the extruded plastic sticks nicely to the bed and you can see that it is being slightly squished.</p>
<p>The printers assembled in the Prusa factory are already fine-tuned and this calibration is needed only in case you build the kit version at home or change the nozzle. The First Layer Calibration is part of the Wizard (last step of the XYZ-Calibration). You can also recalibrate the first layer later on from the <em>LCD-menu - Calibration - First Layer Calibration</em>. During this process, rotate the knob to manually adjust the distance between the nozzle and the bed, while the printer is printing a zig-zag pattern.</p>
<div class="warning-callout">As <strong>each type of sheet (smooth, satin, and textured) has a different thickness</strong> you must use a different First layer calibration for each of them. For this, we have a convenient feature called <a href="http://help.prusa3d.com/article/steel-sheet-profiles_1955">Steel sheet profiles</a>.</div>
<p>With a newly assembled printer, you will start at zero and move into a negative (-) value, reducing the distance between nozzle and heat bed. The initial zero-value is set by the P.I.N.D.A./SuperPINDA. position. <strong>Turn the knob counter-clockwise to bring the nozzle closer to the bed and moving the value away from zero.&nbsp;</strong>The value is unique to each printer and it may also slightly change with time and use. You must, therefore, <strong>check visually when adjusting the height, not by a set value.&nbsp;</strong></p>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/first_layer-768x433-1.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/first_layer-768x433-1-600x338.jpg 600w, https://help.prusa3d.com/wp-content/uploads/first_layer-768x433-1-300x169.jpg 300w" alt="" width="600" height="338"></p>
<p>The first layer calibration being set incorrectly can lead to various issues. With the nozzle too far from the print surface, you risk your print not sticking properly, which can result in a <a href="http://help.prusa3d.com/article/extruder-blob_2005">blob</a>. On the other side, if set too close, you can experience extrusion problems and <a href="http://help.prusa3d.com/article/clogged-nozzle-hotend-mk3s-mk2-5s_2008">clogging</a> and poor print quality, <strong>or even damage to the hardware, like the <a href="http://help.prusa3d.com/article/flexible-steel-sheets-guidepost_2195">Flexible steel sheet</a> due to the print sticking too much.</strong> It is therefore <strong>important to get this right.</strong></p>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-01.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-01-300x62.jpg 300w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-01-600x125.jpg 600w" width="600" height="125" data-hd-align="center"></p>
<p>Before you proceed, make sure that the print surface (satin, smooth, or textured steel-sheet) is clean. You can find information on how to clean it in <a href="http://help.prusa3d.com/article/first-layer-issues_1804">PEI print surface preparation</a>. There are some small differences between how it should look on the textured and smooth steel sheet. We will, therefore, present pictures and guidelines for both, starting with the smooth sheet.</p>
<div>
<div class="note-callout" style="text-align: center;"><strong>Turn the knob counter-clockwise to bring the nozzle closer to the bed.</strong></div>
</div>
<h3>Smooth sheet</h3>
<h4>Too high</h4>
<p><strong>You want the line flattened, but not squished.</strong> On the square at the end of the test line, you do not want any <strong>gaps between the lines (<span style="color: #e03e2d;">left picture</span>), which means it is too high.&nbsp;</strong>In that case, the value will be too close to zero</p>
<h4>Too low</h4>
<p>If the nozzle is set too low (<span style="color: #e03e2d;">right picture</span>) you will see the line squished completely flat and the end square will have <strong>ridges between the lines, which is a clear sign it is set too low</strong> and the value will be too far away from zero. When it is too low, the edges of the square can also start curling upwards. In the extreme, the filament will be spread so thin you will be able to see through the printed filament, leading to clogging of your hotend.</p>
<h4>Just right</h4>
<p>A correct adjustment will show you an even surface (<span style="color: #2dc26b;">center picture</span>), with no gaps between lines, nor ridges. As stated, the numeric value depends on the exact position of the P.I.N.D.A./SuperPINDA sensor, which will be unique to each machine and means nothing without a visual reference. <strong>However, a common range is from -0.400 to -1.500.</strong></p>
<p><img decoding="async" src="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-02.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-02-300x119.jpg 300w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-02-600x238.jpg 600w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-02-768x305.jpg 768w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-02-800x318.jpg 800w"></p>
<div class="note-callout">Adjusting it closer can in some cases improve adhesion. However, if you are having problems with adhesion, but your first layer calibration looks like the 'good' picture (<span style="color: #2dc26b;">center picture</span>), your problem lies somewhere else, like a dirty/greasy sheet, print-settings, bed leveling/XYZ calibration, or under-extrusion.</div>
<p><img decoding="async" loading="lazy" src="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-03fix-2.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-03fix-2-600x214.jpg 600w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-03fix-2-800x286.jpg 800w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-03fix-2-300x107.jpg 300w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-03fix-2-768x274.jpg 768w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-03fix-2-1536x548.jpg 1536w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-03fix-2-2048x731.jpg 2048w" alt="" width="1121" height="400"></p>
<div class="warning-callout"><strong>You can not use the same first layer calibration if you swap between the Smooth and the textured sheet!&nbsp;</strong>For more information, please see <a href="http://help.prusa3d.com/article/steel-sheet-profiles_1955">Steel sheet profiles</a>.</div>
<h3>Textured sheet</h3>
<p>The textured sheets are thinner than the sheets with smooth PEI, therefore you need to move the nozzle bit closer, but you are seeking the same results as with the smooth sheet. Again, if <strong>it is set too low (<span style="color: #e03e2d;">right picture</span>) the filament can start curling up</strong> around the edges like it is not adhering. The numeric value will be too far from zero and must be adjusted back.</p>
<p>If set too high, you will see the line being round, and have gaps between the lines of the end-square. In this case, the value is too close to zero.</p>
<p><img decoding="async" title="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-04-300x119.jpg 300w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-04-600x238.jpg 600w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-04-768x305.jpg 768w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-04-800x318.jpg 800w" src="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-04.jpg"></p>
<h3>Have a look at the nozzle</h3>
<p>A single layer is about 0.2 mm / 0.00787402 inch. Having a look at the nozzle and its distance to the sheet can also be helpful. However, measuring the printed layer with calipers is not a recommended method to calibrate the first layer.</p>
<p><img decoding="async" title="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-05-300x119.jpg 300w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-05-600x238.jpg 600w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-05-768x305.jpg 768w, https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-05-800x318.jpg 800w" src="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-05.jpg"></p>
<h3>When to run the First layer calibration</h3>
<p>Generally, the&nbsp;<strong>first layer calibration</strong> should be performed every time there is a <strong>major change in the assembly.</strong> This includes changing the nozzle, extruder upgrades, or other updates to any axis. You should also run all calibrations if you move the printer to a different location.</p>
<div class="tip-callout">For First Layer Calibrations with other nozzle diameters than 0.4 mm, please see <a href="http://help.prusa3d.com/article/different-nozzle-types_2193#first-layer-calibration-of-other-nozzles">this article</a></div>
<h3>Other issues</h3>
<ul>
<li>If the width of the line varies across its length, you may have to do some <a href="http://help.prusa3d.com/article/bed-level-correction_2267">Bed Level Correction</a>.</li>
<li>If the nozzle comes in contact with the bed, the SuperPINDA/P.I.N.D.A. leveling sensor is not being triggered by the flexible steel sheet and must be physically moved lower in its holder. This will bring it closer to the level of the nozzle tip. You should make sure it is adjusted as instructed in the <a href="http://help.prusa3d.com/guide/9-preflight-check_76792">Preflight check</a> in the Assembly manual. <strong>If you move the leveling sensor you must redo the First layer calibration.</strong></li>
</ul>

First Layer Calibration (i3)

<p>Every FFF (Fused Filament Fabrication) printer requires a First Layer Calibration, which <strong>sets the vertical "Z" distance between the nozzle and the print surface</strong>. Sometimes this value needs <strong>a slight adjustment</strong> and for this situation, there is an option called "<strong>Live adjust Z"</strong> <em>(as you are mostly tuning it live during the first layers of your print).</em> The reason for adjusting the distance is to mostly <strong>provide better adhesion</strong> of the extruded filament.</p>
<h3><strong>How does it work?</strong></h3>
<p>It is important to know the following:</p>
<ul>
<li>the default value before the First layer calibration starts at zero (0.000) for all printers</li>
<li>to get <strong>closer to the print surface</strong>, turn the knob <strong>counter-clockwise</strong> and further <strong>increase the negative value</strong> (e.g. -0.500 =&gt; -0.600 =&gt; -0.700...)</li>
<li>to get <strong>further from the print surface</strong>, turn the knob <strong>clockwise</strong> and continue <strong>lowering the negative value</strong> (e.g. -0.700 =&gt; -0.600 =&gt; -0.500...)</li>
</ul>
<p>The values of the <em>Live adjust Z</em> are typically in the range of -1.500 to -0.200. Going above zero into the positive values is not possible, this indicates either an issue with the measuring sensor (M.I.N.D.A., P.I.N.D.A., SuperPINDA) or incorrect alignment.</p>
<p>The correctly assembled print head has <strong>the sensor always slightly above the nozzle</strong>, never at an equal level or below the nozzle (see the picture below). <em>The exact position can slightly vary, use the last chapter of the assembly manual of your printer to set the rough distance.</em></p>
<p style="text-align: center;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/XYZ-Calibration-MK3-and-MK3S-04.jpeg" alt="" width="718" height="350" loading="lazy" /></p>
<p style="text-align: center;"><em>Example of the MK3S extruder</em></p>
<h3>Live Adjust Z (while printing)</h3>
<p>The most common approach is to perform the <em>Live adjust Z</em> during the print. Go to <em>LCD Menu -&gt;</em> <span style="color: #000000;" data-hd-color="#000000" data-hd-highlight=""><em>Live adjust Z.</em></span> This will show the <span style="color: #000000;" data-hd-color="#000000" data-hd-highlight=""><em>Live adjust Z</em></span> value you have set in the First layer calibration. From here you can adjust it by rotating the knob.</p>
<p>The <strong>Original Prusa MK4</strong> and <strong>Original Prusa XL</strong> are equipped with a loadcell, which will calibrate the first layer automatically. In case you would still like to fine-tune it, you can long-press the knob while the first layer is printed.</p>
<p><img decoding="async" style="max-height: 300px; display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-1-1.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-1-1-600x194.jpg 600w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-1-1-800x258.jpg 800w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-1-1-300x97.jpg 300w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-1-1-768x248.jpg 768w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-1-1.jpg 1600w" width="600" height="194" loading="lazy" data-hd-height="300px" data-hd-align="center" /></p>
<p style="text-align: center;"><em>Example of the MK3S menu</em></p>
<div>
<div class="tip-callout">PRO tip: shortcut from the main screen, while printing the first few layers press and hold the knob for a few seconds to access the <em>Live adjust Z</em> screen.</div>
</div>
<div>
<div class="warning-callout"><strong>Adjusting Live adjust Z value while printing is permanent</strong>, not only for the ongoing print! The new value will also remain after you turn OFF the printer.</div>
</div>
<div>In the picture below you can see examples of different <em>Live adjust Z</em> values. If the nozzle is too high from the surface, the filament won't stick properly (left), if the nozzle is too close to the surface, the filament won't be able to "flow out" leading to a potential clog of the nozzle (right).</div>
<p><img decoding="async" src="https://help.prusa3d.com/wp-content/uploads/First-Layer-Calibration-04.jpg" alt="" width="1132" height="450" loading="lazy" /></p>
<h3>Live Adjust Z (before the print)</h3>
<p>You can also change the value while the printer is at rest from <em>LCDMenu -&gt; Settings -&gt; Live adjust Z.</em> You will see the value set previously during the First layer calibration, and from here you can adjust it by rotating the knob.</p>
<p><img decoding="async" style="max-height: 300px; display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-2.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-2-600x194.jpg 600w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-2-800x258.jpg 800w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-2-300x97.jpg 300w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-2-768x248.jpg 768w, https://help.prusa3d.com/wp-content/uploads/2022/05/Live-adjust-z-2.jpg 1600w" width="600" height="194" loading="lazy" data-hd-height="300px" data-hd-align="center" /></p>
<p style="text-align: center;"><em>Example of the MK3S menu</em></p>
<p><strong>The Live adjust Z should be used only to fine-tune the distance</strong>. For example, PETG and other high-temperature materials require to be squished in the surface slightly more as they tend to warp (lift up), compared to the PLA. If you have replaced the sensor or disassembled the print head (extruder) you should run the <a href="http://help.prusa3d.com/article/first-layer-calibration-i3_112364">First Layer Calibration (i3)</a> instead.</p>
<div> </div>


Live adjust Z

Printer troubleshooting

QR Error codes

<h3>What happened?</h3>
<p>While flashing firmware to your printer an error might occur, and the screen will display the following message: "Firmware in the internal flash corrupted!". The system inside the printer consists of two subsystems. First, there is a bootloader, which then allows the firmware (operating system) to load. While flashing the firmware, something went wrong, and the bootloader is now unable to load it. <strong>Don't worry your printer is OK! You just need to reflash the firmware.</strong></p>
<p>Error name: Error!</p>
<p>Error code: #12608</p>
<h3>How to fix it?</h3>
<p>Each firmware is tested multiple times before being made public, so the problem is most probably in the flashing procedure.</p>
<p>First, place the USB flash drive back into the computer. <strong>Delete both files and copy them again</strong> from the computer to the USB flash drive. Don't rush and wait until the transfer is fully completed. To be 100 % sure, unmount the flash drive in your operating system before physically removing the drive from the computer. <strong>Insert the drive back into the printer and restart it</strong>. This should initiate the flashing procedure. If not, reboot the printer using the reset button directly next to the knob and while the printer is booting up, press once the rotating knob. This "forces" the printer to look for firmware (more about this <a href="https://help.prusa3d.com/article/firmware-updating-mini-mini_124784#alternative-method-older-firmware-release">alternative method</a>).</p>
<p>In case the troubleshooting in the previous paragraph didn't help. <strong>The problem might be in the USB flash drive. Find any other USB drive</strong> in your household, make sure it is formatted to FAT32, copy both firmware files and <strong>repeat the previously described procedure</strong>.</p>
<p>Are you still having issues? Contact our support team and let them know, that you have tried to fix the issue with these instructions. We will take it from there.</p>


Firmware in the internal flash corrupted! #12608 (MINI)

Printer maintenance

<p></p>
<p>A 'cold pull' is a technique that allows you to clean your printer’s nozzle and hotend from any material that may be stuck or burnt inside. You can also use it to clean your hotend during your usual maintenance routine.</p>
<div class="warning-callout">If you are using Nozzle X, <strong>do not</strong> use the cold-pull method, but only use cleaning filament.</div>
<p>The cold pull should be made if your nozzle is only partially clogged, and some filament is still being extruded. If the nozzle is completely clogged, please check the <a href="http://help.prusa3d.com/article/clogged-nozzle-hotend-mk3s-mk2-5s_2008">Clogged nozzle guide</a>.</p>
<div class="tip-callout">Our testing has found that <strong>PLA works best for a cold pull,</strong> as other filaments do not retain the tip as PLA does and they will either tear or melt too much. However, there are filaments specifically made for cleaning hotends.</div>
<h3>Procedure</h3>
<ol>
<li>Go to the <em>LCD Menu -&gt; Settings -&gt; Temperature -&gt; Nozzle</em> and set the temperature to 270 °C.</li>
<li>While waiting for the nozzle to reach the temperature, toggle the <strong>Filament autoload</strong> off in the <em>LCD Menu -&gt; Settings -&gt; F. autoload.</em></li>
<li>Still being in the <em>Menu</em>, go to <em>Settings</em> and choose <em>Disable steppers</em>. <em>There is no message of the steppers being disabled, but you may hear an electrical hiss disappear when selected. <strong>If you can move the bed or extruder on its axis by hand, they are disabled.</strong></em></li>
<li>Open the Extruder Idler door. <em>Unscrew the screws circled below using a 2.5 mm Allen key. On the MMU2S, unscrew the Bowden PTFE tube that connects the MMU unit with the extruder.</em></li>
</ol>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 48.805%;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/idler2.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/idler2-300x300.jpg 300w, https://help.prusa3d.com/wp-content/uploads/idler2-400x400.jpg 400w, https://help.prusa3d.com/wp-content/uploads/idler2-768x768.jpg 768w, https://help.prusa3d.com/wp-content/uploads/idler2-600x600.jpg 600w" alt="" width="400" height="399" loading="lazy" /></td>
<td style="width: 48.9057%;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/mmus2.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/mmus2-300x216.jpg 300w, https://help.prusa3d.com/wp-content/uploads/mmus2-554x400.jpg 554w, https://help.prusa3d.com/wp-content/uploads/mmus2-768x554.jpg 768w, https://help.prusa3d.com/wp-content/uploads/mmus2-800x577.jpg 800w" alt="mmu" width="400" height="290" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="5">
<li>Once it has reached 270 °C, insert PLA filament manually into the extruder and push it in until it starts pouring out of the nozzle.</li>
<li>Stop heating by pressing <em>Cooldown</em> in the <em>LCD Menu -&gt; Preheat</em> (scroll all the way down), or by pressing the reset (X) button. Let the nozzle temperature drop to room temperature. <em>To speed up the cooling you can engage the print fan at full speed, from LCD menu -&gt; Settings -&gt; Temperatures -&gt; Fan speed -&gt; [255].</em></li>
<li>Continue manually pushing the filament down until the temperature is too low for it to melt and come out (around 170 °C for PLA). <em>The nozzle has to be filled for the cold pull to be successful.</em></li>
<li>Pick away extruded material so there is nothing obstructing the pull later on.</li>
<li>After the nozzle cools down to the room temperature, go again to the <em>LCD Menu -&gt; Settings -&gt; Temperature -&gt; Nozzle</em> and set the temperature to 85 °C.</li>
<li><strong>As soon as the extruder reaches this temperature</strong>, grab the filament with pliers and pull it slowly but steadily out of the extruder. <em>The filament can break inside. Make sure to pull straight upwards, not sideways. Hold the extruder with your other hand.</em></li>
<li>Don't stop until the filament is completely pulled out from the extruder.</li>
</ol>
<h3>Results</h3>
<p>On the tip of the filament that has been pulled out, you may see remnants of the previous material(s) you have been using or some burnt dirt that has settled in the nozzle (left picture). You might want to repeat this procedure several times until the filament comes out clean.</p>
<p>The right picture shows what a clean cold-pulled filament should look like. It is important to have the imprint of the nozzle on it, this way you are sure the nozzle was filled and nothing was left inside. Also, the color is not mixed with the one you have been using previously or have dark marks on it.</p>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 48.805%;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/dirty-cold-pull.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/dirty-cold-pull-300x214.jpg 300w, https://help.prusa3d.com/wp-content/uploads/dirty-cold-pull-561x400.jpg 561w, https://help.prusa3d.com/wp-content/uploads/dirty-cold-pull-768x548.jpg 768w, https://help.prusa3d.com/wp-content/uploads/dirty-cold-pull-800x571.jpg 800w" alt="dirty cold pull" width="400" height="286" loading="lazy" /></td>
<td style="width: 48.9057%;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://help.prusa3d.com/wp-content/uploads/clean-cold-pull.jpg" sizes="100vw" srcset="https://help.prusa3d.com/wp-content/uploads/clean-cold-pull-300x203.jpg 300w, https://help.prusa3d.com/wp-content/uploads/clean-cold-pull-591x400.jpg 591w, https://help.prusa3d.com/wp-content/uploads/clean-cold-pull-768x520.jpg 768w, https://help.prusa3d.com/wp-content/uploads/clean-cold-pull-800x542.jpg 800w" alt="clean cold pull" width="693" height="469" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>After the procedure</h3>
<p>Secure the idler door by having <strong>the head of the idler screw</strong>, on the left of the extruder, <strong>about flush with the plastic parts, when the filament is not loaded.</strong> Then we recommend running the Z calibration (<em>LCD menu -&gt; Calibration -&gt; Calibrate Z</em>) as pushing on the extruder might have thrown it off balance. Also, turn Autoload of filament back on, if you prefer this feature.</p>
<div class="note-callout">Please see <a href="http://help.prusa3d.com/article/under-extrusion_2007">this article</a> to learn about the most common causes leading to filament extrusion problems and how to prevent them from happening.</div>

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A loose nextruder nozzle is very, very confusing :-).

Material Change during printing

Anybody here get Prusalink to work?

Prusalink won’t let me login

Flow Confusion

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