ProosaXY

CoreXY conversion for Prusa MK3/S. This build is aiming at getting more performance out of your 6 years old machine with the lowest cost possible by re-using most the MK3/S stock parts.

1. Features

• Better performance (check input-shaper graph bellow).
• Semi-enclosure by default. Panels mount and top hat parts will be added later.
• Dual z axis(default) or independent tripple Z axis(Optional) Triple Z (independent or sync based on controller board) by default or dual Z(optional).
• Single v6 hotend(default) or mixed 2-in-1-out hotend(WIP).
• Optional AUX cooling fan.
• Semi-enclosured(default) or Fully-enclosured with top hat(comming soon).
• Our industrial leading SnakeOil technology :).

2. Status

• [2025/10/26] Tradrack mmu support is added by Jon.
• [2023/07/11] All the main parts design are completed. Test print result are posted in our Discord server
• All part STLs are exported.
• [2023/07/11] Full BOM added 2023/07/11
• I'm working on a simple build log/manual.
• For updates, please visit our Discord server

• The input-shaper calibration is quite good for an 8mm shaft machine, in my opinion. We have a recommended acceleration of about 6000 mm/s2 (which should be used as the limit for outer perimeter acceleration), and a higher maximum acceleration/speed, depending on how fast your motor can run.
• For some extra speed boost, check my slicer plugin (klipper firmware only)

3. Warning - read this

• This mod requires some drilling on the original frame, cutting the original motor leadscrew, and linear shafts. This drilling/cutting is easy enough to be done with a hand drill and a hacksaw BUT THERE IS NO WAY BACK. You won't be able to convert back to the original MK3/s machine if you change your mind later.
• Some small changes/patches might be needed after I have more test data and feedback..
• To keep the cost down and reuse old components, there are some trade-offs I made:
  • The machine is semi-enclosed by default and will need some printed panels and a top hats to fully enclose it.
  • To match the frame height, cutting the motor leadscrew and linear shafts is required.

BOM

Fabreeko ProosaXY Conversion Kit (Open Beta) available now.

>>> Bill of materials <<<

4. Test run videos and images

4.1 Prusa Mk4 12mins bonker benchy

	Mk4 bonker benchy	Real-world print
Video
Description	I use the setting Prusa used on their mk4 12 mins benchy with accel pump up a little. Print result (images)

4.2 Images

5. Copyright Notice

This printer design use the following parts from other opensource project:

• Fan duct from EVA 2.3
• Filament sensor from Bear Extruder And X Axis (BearExxa)
• Sherpa mini extruder from Annex Engineering
• Din mounter from Voron design
• Original hardwares from Prusa MK3

License

• Sherpa mini extruder is an original work of Annex Engineering, modified parts using their source code/design files are re-released under ANNEX Engineering License.
• EVA2 is an original work of EVA-3D, modified parts using their source code/design files are re-released under GNU General Public License v3.0
• Bear Extruder And X Axis (BearExxa) is an original work of Grégoire Saunier, modified parts using their source code/design files are re-released under GNU General Public License v3.0
• Voron is an original work of Voron design, modified parts using their source code/design files are re-released under GNU General Public License v3.0
• Prusa MK3 is an original work of Prusa3D, modified parts using their source code/design files are re-released under GNU General Public License v2.0
• This printer design(ProosaXY), it's document and software are released under GNU General Public License v3.0