The file 'MGN12 Rail M3 To M4 Adapter 3D Printer Model' is (stl,stp) file type, size is 287.9KB.
This piece dampens vibrations created by MGN12 rails on an alluminium extrusion thus reducing the sound.
It also removes the necessity for M3 T-nuts as the screw holes on the sides are M4 sized.
Everything is modeled with 0.075mm tolerances.
EDIT:
Added a collection of raised end-stop mounts to fit the added height of the carriage. Just take the one, which works best with your setup.
increased_height_end_stops.stl | 86.6KB | |
M3_to_M4_MGN_Adapter.stl | 1.0MB | |
M3_to_M4_MGN_Adapter.stp | 74.2KB |