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.
- 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 :).
- [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)
- 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.
Fabreeko ProosaXY Conversion Kit (Open Beta) available now.
| Mk4 bonker benchy | Real-world print | |
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| Description | I use the setting Prusa used on their mk4 12 mins benchy with accel pump up a little. Print result (images)  |
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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
- 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