Bill of materials video:
Warning: This extruder has seen very limited testing. There is a risk that something will malfunction. If in doubt, I advise waiting for more people to test it and provide feedback before you proceed. This way I'll have time to make further tweaks and build a knowledge base.
If it’s your first time modifying the printer, I suggest staying away from the optional mechanical parts. The IGUS bearings and X-axis replacement are more sensitive to build and print errors and can lead to calibration issues or other not fun problems which you will have to troubleshoot on your own (especially for IGUS bearings, which can lead to calibration errors and the "602" horizontal inconsistency). Update: I advise against using IGUS bearings and instead using high quality ball bearings such as Misumi (which come with new MK3S+ printers). There are many problems that can occur not related to the extruder, but because the axes need to be disassembled and put back together.
Going down the rabbit hole of modding can lead to a barren land devoid of resources where you’re pretty much on your own fixing a cascade of problems you never knew could happen. If the printer works for you, I urge you to enjoy printing without changing anything. And when it doesn’t work, there could be an easy fix out there. Having said that, if you still want to proceed, I admire your bold determination.
Let me first start with the obvious and remind you that the PitStop design is offered as is. I take no responsibility for what you do with it. It can run better, but could also run worse. There are no guarantees. All material is for informational purposes only. By using any information or resources provided you agree that you will use these in a safe and legal manner, consistent with all applicable laws, safety rules, and good common sense. You further agree that you will take the necessary steps to keep any information or hardware out of the hands of minors and untrained and/or immature individuals.
✅ Prusa MK3S printer
✅ Prusa MK2.5S printer (limited testing)
✅ Stock frame (not tested)
✅ Bear frame (except for X-Axis)
✅ MMU2S (optional)
✅ Adapted Revised X-Axis (optional)
✅ Stock bearings
✅ Igus bearings (optional)
✅ stock E3D V6 extruder
✅ Dragon extruder (limited testing)
❌ Bear X-Axis
❌ Revised X-Axis
❌ Other extruders (such as the Mosquito)
As this project was created a long time ago, the old links to products don't work anymore and I have removed them. Sadly, I don't have time to add new ones.
If owning only one printer, consider printing the parts twice in case some break (especially the fan duct).
To connect the new fan to the board you can either find a good extension cable or splice your own:
This option is hard to revert should you decide to move back to the stock extruder.
Please note that soldering is not explained in the assembly guide. You are expected to know how to solder properly. Bad wiring can lead to fire or other problems. If in doubt, use the alternative wire splicing covered in the assembly guide.
Bare minimum parts and tools
Most accessories and tools