This page contains all the files and information to use the Bear X axis with the original Bondtech Prusa Upgrade Extruder MK2(S), MK2.5(S), MK3(S), Mosquito MK2.5(S), Mosquito MK3(S).
The original Bondtech Prusa Upgrade Extruder needs a dedicated Bear X carriage to be used with the Bear X axis.
📌 Note that in order to be sure inconsistent extrusion is cured with this extruder we highly recommend to use one of our recommended fans.
Due to a different belt path, the Bear X carriage for Bondtech Prusa Upgrade extruder and Bear X axis (X ends) are matched to each other and cannot be used separately. As a unit, they are compatible with both Original Prusa frames and Bear Upgrade frames.
The Bear X carriage for Bondtech Prusa Upgrade is not compatible with Original Prusa X axis (X ends).
If you are already using the Bear X ends with another extruder, you only need to add this Bear X carriage for Bondtech Prusa Upgrade.
Note that the Bondtech Prusa Upgrade extruder needs a custom firmware, independently of the X axis used.
This is the list of extra material you will need from original Prusa extruder
| Part | Quantity (pce) |
Detail |
|---|---|---|
| Bondtech Prusa Upgrade Extruder and Motor | 1 | |
| Dowel pin diameter: 3mm, length: 15mm to 15.8mm |
1 | Must fit the 2GT idler bearing. 📌 Cut a M3 screw if you can't find one |
| M3 Hex nylock nuts (DIN 985) | 2 | |
| M3 Hex nuts (DIN 934) | 3 |
Download the printed parts corresponding to your Bondtech extruder version (hotend and Prusa).
For E3D v6 hotend:
- MK2S : bear_bondtech_e3d_mk2s_mk2.5.zip
- MK2.5 : bear_bondtech_e3d_mk2s_mk2.5.zip
- MK2.5S : bear_bondtech_e3d_mk2.5s.zip
- MK3 : bear_bondtech_e3d_mk3.zip
- MK3S : bear_bondtech_e3d_mk3s.zip
For Slice Engineering Mosquito hotend:
- MK2.5S : bear_bondtech_mosquito_mk2.5s.zip
- MK3S : bear_bondtech_mosquito_mk3s.zip
- Slicer : PrusaSlicer recommended
- Infill type : Gyroid recommended
- Support : No
- Brim : No
- Detect thin walls : No
- Perimeters width (internal and external) : 0.45mm
| Part | Quantity | Layer Height | Infill | Perimeters | Top/Bottom Layers | Filament Type |
|---|---|---|---|---|---|---|
| bondtech_x_carriage_mkX.stl | 1 | 0.20mm | 20% | 4 | 5 | PETG |
| x_end_idler | 1 | 0.20mm | 20% | 4 | 5 | PETG |
| x_end_idler_tensioner | 1 | 0.20mm | 20% | 4 | 5 | PETG |
| x_end_motor | 1 | 0.20mm | 20% | 4 | 5 | PETG |
| cable_guide_back_a | 1 | 0.20mm | 20% | 4 | 5 | PETG |
| cable_guide_back_b | 1 | 0.20mm | 20% | 4 | 5 | PETG |
| x_carriage_back | 1 | 0.20mm | 20% | 3 | 5 | PETG |
You can find more details about recommended filaments in on our FAQ.
The assembly guide is available on this page of guides.bear-lab.com.
All source files in Fusion 360 and STEP format can be download here.
Thank you to Bondtech for having listen several of my design propositions for this extruder. Thank you to the BPE2000 group for the chat and support.