Prusa Full Bear 2.1-alpha Y motor mount with shaft support bearing
Description
This part is a remix of the Y motor mount for Prusa Bear 2.1.0 (still in 2.1.0-alpha1 at the time I made this). See [original bear mount on @gregsaun / @pekcitron Github](https://github.com/gregsaun/prusa_i3_bear_upgrade/blob/2.1.0-alpha1/printed_parts/mk3_mk3s/stl/y_motor_mount.stl). It's the same idea as published by @sourekv, but for a newer Bear version. It adds a 625 ball bearing to the motor mount so that the shaft's end is supported, rerouting some of the forces introduced by belt tension, hopefully leading to smoother Y travel. The bearing will require some force to press into the opening, and should be possible to extract again without damaging the bearing or printed part. It can be a pretty tight fit though and success will depend a lot on your extrusion accuracy.
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