⬢Needle-nose pliers for zip tie trimming.
⬢2.5mm Allen
⬢1.5mm Allen
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- Original Prusa i3 MK3/MK3S to MK3S+ upgrade
- 2B. MK3S Extruder disassembly
2B. MK3S Extruder disassembly
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- Original Prusa i3 MK3/MK3S to MK3S+ upgrade
- 1. Introduction
- 2A. MK3 Extruder disassembly
- 2B. MK3S Extruder disassembly
- 1. Tools necessary for this chapter
- 2. Preparing the printer
- 3. Releasing the cable bundle
- 4. Disconnecting the electronics
- 5. Removing the x-carriage-back
- 6. Removing the P.I.N.D.A. sensor
- 7. Removing the filament sensor
- 8. Removing the fans
- 9. Extruder surgery
- 10. Removing the extruder-body
- 11. Removing the PTFE tube
- 12. Inserting the new PTFE tube
- 13. Idler disassembly
- 14. Disassembly is finished!
- 3A. MK3 Extruder upgrade
- 3B. MK3S Extruder upgrade
- 4. Electronics assembly
- 5. Y-axis upgrade
- 6. Preflight check
2B. MK3S Extruder disassembly
Relevant for:
Last updated 4 years ago Difficulty
Moderate Steps
14 Available languages
Before you start, make sure that:
⬢the filament is unloaded from the hotend
⬢the printer is properly cooled down
⬢the printer is unplugged
⬢Move the Z-axis to half its height.
⬢Move the X-axis to the center.
⬢It's recommended to use any cloth or piece of fabric, which is thick enough and covers the heatbed. This will ensure you won't damage (scratch) the surface during the disassembly.
⬢Using an Allen key release the M3x40 screw and open the door.
⬢Release two M3x10 screws and remove the Extruder-cable-clip. On older printers cut the zip tie.
⬢In case there are zip ties inside the Einsy-case, carefully remove them.
⬢Remove the zip ties on the cable holder.
⬢Remove the textile sleeve all the way to the Einsy-case.
⬢Disconnect the P.I.N.D.A. sensor from the Einsy board.
WARNING: the P.I.N.D.A. sensor cable has a safety latch, don't pull it! First, push the safety latch to ensure the connector is free to move.
⬢Release four screws on the X-carriage-back part.
⬢Remove the X-carriage-back from the extruder and let it hang on the cable bundle.
Do not throw away the X-carriage-back. Keep it for reuse in the following chapter.
⬢Push the P.I.N.D.A. sensor cable through the opening in the X-carriage-back so you can remove the probe later.
⬢Remove the the nylon filament from the printer.
⬢Release the screw on the P.I.N.D.A. holder.
⬢Remove the P.I.N.D.A. sensor from the printer.
⬢Push the P.I.N.D.A. cable out of the printer between the X-belt and the smooth rod.
⬢Release and remove the M3x40 screw with the spring from the side of the extruder.
⬢Release the screw on the Fs-cover.
⬢Remove the Fs-cover from the extruder.
⬢Using the 1.5mm Allen key release the M2x8 screw holding the filament sensor.
⬢Unplug the sensor and remove it from the printer.
Your printer may have a black or red version of the filament sensor. The red is a newer, more optimized version. If you have the red one already, you can re-use it later. If you have a black one, keep it as a spare. Filament detection works the same way on both.
⬢Release four screws on the hotend (left) fan and remove it from the extruder.
⬢Release two screws on the print (front) fan and remove it from the extruder.
⬢Remove the Fan-shroud.
⬢Use the 2.5mm Allen key with the ball-end and release the screw on the Print-fan-support.
⬢Remove the Print-fan-support from the extruder.
⬢Carefully put both fans on the heatbed.
⬢Release two screws on the Extruder-cover and remove the Extruder-cover from the hotend.
⬢Release the left M3x40 screw from the back of the extruder.
⬢Remove the extruder idler from the printer.
⬢Hold by hand the extruder motor and release the second M3x40 screw from the extruder. Carefully remove the extruder motor.
⬢Carefully put the extruder motor on the heatbed.
⬢Remove the Adapter-printer with the ball inside from the extruder-body. Be careful, the ball tends to jump out and roll away.
⬢Release the M3x18 from the Fs-lever and remove it from the part.
⬢Release the remaining two screws from the Extruder-body.
⬢Remove the Extruder-body from the printer.
THIS STEP IS OBLIGATORY! The MK3S+ is using a shorter PTFE tube compared to the MK3S, let's replace it now!
⬢Press the black plastic collet down towards the hotend.
⬢Remove the old PTFE tube from the hotend.
⬢Open the upgrade package and look for a bag with the new (shorter) PTFE tubes
⬢Check the new PTFE tube. Make sure both ends are clean.
⬢Now it is time to insert the new PTFE tube. Note there are two different ends:
⬢One end of the tube has a "rounded" outer edge. This end must be inside the hotend.
⬢Look at the other end, where the tube is drilled inside, the shape of the edge is "conical". This is the side, where filament enters the tube. This part must be outside the hotend.
⬢Push the black collet in. Slide the tube all the way in and hold it!
⬢Using second hand pull the collet out and only then release the tube!!! THIS IS CRUCIAL for the hotend to work properly. The tube must not be able to move in or out!
⬢Push and pull out the shaft. Keep it for later.
⬢Take out the Bondtech gear, BUT BE CAREFUL, there are two bearings inside. Don't lose them!!!
The printed part will be replaced with a new one.
⬢We are done here!
Before you move on, let's recap:
⬢Store or throw away all the old extruder plastic parts, you won't need them. Except the X-carriage which is still attached to the bearings and the X-carriage-back with the cables going through.
⬢Keep both fans, hotend (with replaced PTFE), Nylon filament and the X-axis belt.
⬢Keep the motor and both Bondtech gears including bearings and the shaft.
⬢The disassembled filament sensor with the cable will be replaced with a new one. You can keep this one for your future projects ;)
⬢Fasteners are included in the upgrade kit. However, keep the ones from the extruder as a spare.
⬢Now let's move to: 3B. MK3S Extruder upgrade.
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