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for_mk2.5 Update Jan 22, 2019
for_mk2_mk2s Remove useless M5x10 Jan 31, 2019
for_mk3 MK3 use shorter PSU M4 screws Feb 6, 2019 now support both Openbuilds lower profile screws or ISO 7380 button h… Apr 28, 2018

Prusa i3 Bear Full Upgrade

This is the FULL version of the Prusa i3 Bear upgrade. A much stronger frame for your MK2, MK2s, MK2.5 or MK3. If you are searching for a cheaper and simpler upgrade check out half upgrade version or spot the differences on the home page.


  • Stronger and quieter
  • Easier to maintain and customise
  • Use as much as possible original parts (no need to print a new RAMBo cover nor change any cable, rods or firmware)
  • Compatible with MK2, MK2s, MK2.5 and MK3
  • Highly detailed manual
  • Use more aluminum and less printed parts (3D printed parts can crack and are less reliable)
  • Use Openbuilds hardware :
    • Single platform of multitude compatible hardware parts
    • V-Slot offer more possibilities to printed parts and customisation than T-Slot
    • Open source with powerful community
    • Easy to square and build
    • Worldwide shipping plus several other shops selling these parts
  • Other type of aluminum extrusions can be supported thanks to parametric design (check Fusion 360 files)
  • 3D printed parts designed using advanced techniques like selective infill, clean vertical holes, sharp angle...
  • Open source by providing STL, STEP and Autodesk Fusion 360 files
  • Z motors can be easily removed for maintenance
  • Fix some dimensional errors of Z axis from Original Prusa i3


The full upgrade is split in 3 different versions depending the printer version you would like to upgrade :

Those versions are split in 3 folders and they have their own printed parts, manual, documentation, etc. Just go to full upgrade folder that match your printer and use the STL files and manual from their.

Be sure to get the correct version according to your printer

Prusa i3 Bear Full Upgrade MK2s

Prusa i3 Bear Full Upgrade MK2.5

Prusa i3 Bear Full Upgrade MK3