Adapted Revised X-Axis for Prusa i3 printers

I’ve adapted the Revised X-Axis to work with the stock extruder and with the PitStop extruder. Works with the stock Prusa MK2/MK3 frame, as well as with the Bear frame. Additional parts required; see BOM video. This design is derived from Vecko's Revised X-Axis.


✓ Prusa stock extruder (tested by Arcady Genkin)

✓ PitStop extruder

✓ Prusa MK2/MK3 frame (MK3 tested by Arcady Genkin)

✓ Bear frame

✓ stock idler (not tested)

✓ 20T 5mm ID idler

✓ stock bearings

✓ uncompressed Igus RJ4JP-01-08 bearings (optional)


  1. Idler, either:
    • stock idler + M3x12mm screw or M3x16mm grub screw or pin, or
    • Toothed Gates Idler 6mm Belt, 20T, 5mm ID (some say it can improve surface finish and reduce ghosting) E3D store
      + 5x15mm or 5x16mm dowel pin. US store, EU store
  2. Screws:
  3. 6pcs M3x10mm
  4. 9pcs M3x18mm
  5. 12pcs hex or nyloc nuts
  6. Optional Igus RJ4JP-01-08 (only if having issues with stock bearings). US store, EU store, UK store
  7. Printed parts. I recommend 4+ perimeters and 30% infill. You may have to file them a bit if the tensioner doesn’t easily slide in the larger x-idler part.
  8. One x-motor
  9. One x-idler
  10. One x-idler-tensioner (corresponding to the idler)
  11. Two bearing spacers (optional)
  12. 8mm drill bit (if the rods don’t fit)
  13. Check Vecko’s original page for more details and instructions
Download STLDownload STL + STEP