3D printed parts converted from stl files published by Prusa with version R4.
https://www.printables.com/model/531604-mmu3-printable-parts
Buffer plate converted from dxf published by Prusa.
https://github.com/prusa3d/Original-Prusa-i3/blob/MMU2/SCAD/s-buffer-plate.dxf
The author remixed this model.
Converted to STEP with FreeCad