With the new Add-On this kit supports MK3s filament sensor.

Download the files for the printable Add-On here:

This extruder upgrade kit is for the Prusa MK2.5 or the Prusa MK3 where you already have the Bondtech gears. This kit contains the necessary parts to convert to our freshly designed extruder that uses 3:1 gearing ratio for improved precision and resolution, optimised geometry for the heat-sink cooling and many other improved features.
It also reduces the moving weight to reduce vibrations and ghosting.

This kit comes with a 25mm pancake stepper that have 18 Ncm in torque for a lightweight but powerful extrusion and a new stepper cable for connecting the motor.

The original part-cooling fan 50×15 radial fan is used in this setup and is not included.

The original 40x40x10 heat-sink cooling fan is used in this setup and is not included.
For more effective HotEnd cooling we recommend a fan with high pressure like Sunon’s MF40100V1-1000U-G99 or similar.

The original filament sensor cover is used and is not included.

This extruder will fit the stock MK2.5 / MK3 carriage’s and also other popular designs like Vecko, Zaribo and Bear. Check the guide for available X-Carriage here:

The E-steps needs to be updated to 415 for MK2, MK2s and MK2.5 and is easy to do by downloading this g-code file, put it on the SD card and select to print the file esteps.gcode which will set the esteps and save it. For MK3 it needs to be 830 as it uses 32 bit microstepping, use this file instead.

Weight reduction is 121 g, from 387g as default setup compared to 266g for this setup (Extruder, motor)

This project is licenced under GPL V3 and the STEP-files are available for download here: