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There are 2 kit options:

• Partial kit - includes printed parts and screws(no motor or gears)
• Full kit - everything included

This extruder upgrade kit is for the Prusa MK2 or the Prusa MK2S where you don't have the Bondtech gears. This kit contains the necessary parts to convert to Bondtech's freshly designed extruder that uses 3:1 gearing ratio for improved precision and resolution, optimized geometry for the heat-sink cooling and many other improved features It also reduces the moving weight to reduce vibrations and ghosting.

The extruder parts are not optimized for FDM printing but for SLS printing that Bondtech uses to produce the housing parts in polyamide 12 for maximum precision and strength.

This kit comes with this 25 mm 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 50x15 radial fan is used in this setup and is not included.

This setup is made to use a 40x40x10 heat-sink cooling fan that needs to be purchased separately, it is not included. The original part-cooling fan on MK2 and MK2S is 30x30x10 and will not fit.

An FDM-printed filament sensor cover is included.

This extruder will not fit the carriage on the MK2 / MK2S so a new carriage needs to be printed. It also fits the MK3, Zaribo, Veckoj carriage, a new version of the Bear carriage especially made for this is in the works and should be available shortly.

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 387 g as default setup compared to 266 g for this setup (Extruder, steppermotor)

This project is licenced under GPL V3 and the step-files will be available when Bondtech ship the first products.

Installation Guide

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