For improved reliability and print quality, the Bear extruder is slightly taller than the original MK2.5S/MK3S extruder. We provide customized firmware to pass Selftest and (XY)Z Calibration. After those steps you have the choice to keep using our customized firmware or flash stock firmware. In either case, you use our firmware at your own risk.

Select and download the latest Bear calibration firmware here: github.com/bear-lab-3d/Prusa-Firmware/re...:

MK3S Einsy-Rambo 10a firmware name: Bear_Cal_FW***_MK3S-EINSy10a.hex

MK2.5S Mini-Rambo 13a firmware name: Bear_Cal_FW***_MK25S-RAMBo13a.zip

MK2.5S Mini-Rambo 10a firmware name: Bear_Cal_FW***_MK25S-RAMBo10a.zip

MK2.5S firmware comes as a ZIP file containing several languages of the firmware. They all contains english. Extract the ZIP file and choose the language you prefer to use (in addition of english).

If you don't know which Mini-Rambo board you have, please refer to this document