⬢For this chapter, please prepare:
⬢2.0mm Allen key
⬢2.5mm Allen key
⬢T8/10 Torx key
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- Original Prusa i3 MK3S/MK3S+ to MK3.5S upgrade
- 6. Heatbed upgrade
6. Heatbed upgrade
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- Original Prusa i3 MK3S/MK3S+ to MK3.5S upgrade
- 1. Introduction
- 2. Parts check
- 3. Printer dissasembly
- 4. xBuddy assembly
- 5. xLCD & PSU assembly
- 6. Heatbed upgrade
- 1. Tools necessary for this chapter
- 2. Removing the heatbed thermistor
- 3. New heatbed thermistor: parts preparation
- 4. Preparing the heatbed and thermistor
- 5. Covering the thermistor
- 6. Fixing the thermistor in place
- 7. Heatbed cable assembly: parts preparation
- 8. Heatbed cable assembly (part 1)
- 9. Heatbed cable assembly (part 2)
- 10. Heatbed cable assembly (part 3)
- 11. Covering the heatbed cables: parts preparation
- 12. Assembling the heatbed-cable-cover-bottom
- 13. Assembling the heatbed-cable-cover: nylon filament
- 14. Assembling the heatbed-cable-cover-bottom
- 15. Assembling the heatbed-cable-cover-top
- 16. Wraping the textile sleeve
- 17. Installing the Expansion joints: parts preparation
- 18. Preparing the expansion joints
- 19. Installing the Expansion joints
- 20. Attaching the heatbed: parts preparation
- 21. Attaching the heatbed
- 22. Tightening the heatbed
- 23. Guiding the heatbed cables: parts preparation
- 24. Assembling the Wi-Fi
- 25. Guiding the heatbed cables
- 26. Installing the WiFi cover assembly
- 27. Reward yourself!
- 28. Almost there
- 7. Extruder & connectivity upgrade
- 8. Preflight check
- Manual changelog MK3.5S upgrade
6. Heatbed upgrade
Relevant for:
Last updated 2 days ago Difficulty
Moderate Steps
28 Available languages
In the upcoming steps, you will replace the old heatbed thermistor (from your previous printer model) with a new version that is compatible with MK4, MK3.9, and MK3.5.
If you purchased a new heatbed with the upgrade kit — commonly for users with printers featuring 2+1 screws on the old heatbed — ensure that the new thermistor is pre-installed. You can easily verify this by checking for a white connector at the end of the thermistor cable. The presence of this connector indicates that the new thermistor is already in place and you can skip to Heatbed cable assembly: parts preparation
⬢From the bottom side of the heatbed, peel off the yellow Kapton tape and silver aluminum tape.
⬢Remove the heatbed thermistor cable from the heatbed.
⬢For the following steps, please prepare:
⬢MK4 Heatbed thermistor (1x)
⬢Kapton tape (1x)
⬢Aluminum tape (1x)
Pay attention to the instructions! The "yellow" Kapton tape tends to curl up and you won't be able to restore its initial shape!!
All the necessary parts can be found in the Heatbed thermistor set bag.
⬢After you have removed the thermistor and the tapes, clean the entire board to remove any grease. You can leave the glue, which was under the aluminum tape.
⬢Place the thermistor on the heatbed. The tip of the thermistor must be in the circle.
If you miss this spot, the printer will read incorrect temperature values.
Note which side the sensor is attached to the heatbed.
⬢Take the silver aluminium tape and carefully peel off the protective film.
⬢Stick the tape to the heatbed, BUT ONLY in the centre of the thermistor (inside the circle shape). We need to double-check the correct position.
⬢Peel or bend the tape slightly, to reveal the tip of the thermistor.
⬢Maintain the thermistor position and cover it with aluminum tape. Ensure that the whole thermistor sensor is covered with the tape.
Now it is time to apply the final "yellow" Kapton tape. DON'T PEEL OFF the entire tape, it will curl up!!!
⬢Peel off about 1 cm (1/2 inch) strip of the Kapton tape and stick it to the heatbed. Make sure the tape adheres properly.
Make sure the Kapton tape does not overlap any screw holes in the heatbed.
The Kapton tape has a bigger area than the silver tape. Make sure the silver tape is overlapped from all sides.
⬢Keep applying the tape. Make sure it doesnt curl too much in the thermistor area.
⬢Check that the entire adhesive surface is properly attached to the heatbed.
⬢For the following step please prepare:
⬢Heatbed MK52 24V (1x)
⬢Heatbed cable red (1x)
⬢Heatbed cable black (1x)
⬢M3x10 screw (2x)
⬢M3w washer (2x)
⬢M3nN nut (2x)
⬢IT IS IMPORTANT to connect the power cable correctly. Before you start the assembly have a look at the pins. The one on the left with "GND" sign must be connected to the BLACK WIRE.
⬢Take both Heatbed cables. Note the label on each cable. For the following steps, prepare the ends of the cables without the label.
⬢Place the black wire above the pin with "GND" sign. Use the end of the cable that is not labeled with QR code. The QR code must be at the other end.
⬢Place the M3w washer above the round cable connector.
⬢Press the M3x10 screw through all parts.
⬢Hold the screw and carefully turn the heatbed upside down.
⬢Attach the M3nN nut onto the M3x10 screw and tighten it slightly.
⬢Turn the heatbed back around. Using the universal wrench and the Allen key, tighten up the screw. We will adjust the cable position later on, therefore do not tighten the screw too firmly yet.
⬢Repeat this procedure for the second (Red / + / VCC) wire. Use the end of the cable that is not labeled with QR code. The QR code must be at the other end.
Before proceeding further, please check again that:
⬢BLACK wire must be connected to the "GND"
⬢RED wire must be connected to the "VCC"
⬢The cable cover, which will be applied later requires the connectors to be slightly inclined towards each other. Press them gently, but leave a gap between them.
Now, tighten both screws firmly using the Allen key and the wrench. Maintain the position of the connectors while tightening.
⬢For the following steps, please prepare:
⬢Nylon 2x380 mm (1x)
⬢heatbed-cable-cover-bottom
⬢heatbed-cable-cover-top
⬢M3x10 screw (3x)
⬢M3n nut (3x)
⬢Textile sleeve 5x350 (1x)
The ends of the textile sleeves are heat-sealed at the factory to prevent ripping. To open them, the sealed end joints must be cut or torn.
⬢Insert three M3n nuts into the shaped openings in the heatbed-cable-cover-bottom.
Use the screw pulling technique.
⬢Place the heatbed-cable-cover-bottom like in the picture. Push the heatbed thermistor cable through the heatbed-cable-cover-bottom.
⬢Insert the nylon filament into the hole in the heatbed-cable-cover-bottom. Don't let the nylon filament stick out too much on the other side. It should not protrude more than 2 millimeters.
When inserting the nylon filament, ensure that the filament does not damage the thermistor cables under the printed part.
⬢Bend the nylon filament slightly toward the cables. Be sure to maintain the correct curve orientation, as shown in the second and third pictures.
⬢Orient the curve of the filament as shown in the third picture.
⬢Slide the cable-cover-bottom under the heatbed cable connectors (M3nN nuts). See the correct orientation in the picture.
⬢Secure the cover with the M3x10 screw from the top. Tighten the screw firmly.
Make sure the nylon filament is still bent upward as in the previous step.
⬢Wrap the end of the cable bundle together with the nylon filament in the textile sleeve. Slide the sleeve as far towards the heatbed as possible.
⬢Attach the heatbed-cable-cover-top onto the junction and secure it with two M3x10 screws.
⬢On the bottom side, leave a slack on the thermistor cable for one finger to be pushed through.
⬢Make sure there is not a large gap between the covers.
⬢Finish wrapping the cable bundle in the textile sleeve. Twist the sleeve around the cables but do not twist cables inside.
⬢For the following steps, please prepare:
⬢Expansion joint (8x)
⬢M3x6r screw (8x)
⬢Install eight M3x6r screws in the outer holes on the Y-carriage. Do not tighten them completely. A few turns are enough for now.
Please note that there are two versions of the Y-carriage. This step describes the instructions for both versions, please be very careful.
The installation of the expansion joints needs to be done carefully. It is crucial for the correct functionality of the printer. Carefully read the instructions:
⬢Slide the expansion joint from the side on the M3x6r screw.
Make sure the expansion joints are correctly oriented. There is a recess with approximately the same shape as the expansion joint. The joint must fit into the recess. See the second picture.
Some of the Y-carriages don't have recesses, depending on the version of the printer model. Position the expansion joints according to the picture.
⬢Maintain the position and tighten the M3x6r screw using the 2.0mm Allen key.
⬢Proceed the same for the rest of the expansion joints.
OLD Y-CARRIAGE: On the old Y-carriage without the recesses, maintain the correct position and orientation of the expansion joint using the universal wrench while tightening.
⬢For the following steps, please prepare:
⬢M3x4bT screw (8x)
⬢M3x14bT screw (1x)
⬢Spacer 3.1x6x8 mm (1x)
⬢Place the spacer onto the Y-carriage and align it with the hole in the center.
⬢Put the heatbed on the Y-carriage and secure it by the M3x14bT going through the spacer. Do not fully tighten the screw yet.
⬢Insert the M3x4bT screws into the remaining holes in the heatbed. Do not fully tighten the screws yet.
⬢After all screws are in place, tighten them using a T10 Torx key in the following sequence:
⬢Center screw
⬢First four screws (edges)
⬢Last four screws (corners)
Tighten the screws firmly and carefully.
⬢For the following steps, please prepare:
⬢MK4S-Wifi-cover (1x)
⬢ESP-WiFi (1x)
⬢M3x12 screw (3x)
⬢Power terminal screw 6/32" (2x)
⬢Insert the ESP-WiFi module into the WiFi-cover, positioning it just below the bridge on the left side.
⬢On the other side, ensure the connector fits correctly into the hole in the cover.
⬢Set the assembly aside for a while.
⬢Push the heatbed cables and heatbed thermistor cable through the square opening on the back of the xBuddy Box.
⬢Push the filament through the circle hole right below the square opening.
⬢Place the black heatbed cable on the left terminal and secure it with the terminal screw 6/32".
⬢Place the red heatbed cable on the right terminal and secure it with the terminal screw 6/32".
⬢Connect the heatbed thermistor cable to the xBuddy board.
Be very careful when handling and connecting the ESP module to avoid bending and damaging the pins.
⬢Take the WiFi cover assembly and connect the ESP module pins to the connector in the xBuddy.
⬢Position the heatbed cable bundle into the cutout in the WiFi cover.
⬢Close the WiFi cover carefully, ensuring the pins of the ESP module are properly engaged in the connector on the xBuddy.
Double-check that the heatbed cable bundle is in place.
⬢Secure the cover with three M3x12 screws.
⬢Eat eight gummy bears.
Did you know that in 2014, a gummy bear-inspired emoji was added to the Unicode Standard, allowing gummy bear enthusiasts to express their love for the candy in digital conversations.
⬢So far nothing complicated, right? Expect nothing complicated :). Let's get into the last few chapters.
⬢Go to chapter 7. Extruder upgrade
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