Prusa-i3-MK3S+ Y Axis right shaft End Stop Bumper 36.2mm upgrade

Prusa i3 MK3S & S+ the zero end stop setup is by forcing the X & Y carriage against the frame.

On the Y axis, only the left shaft bearing is abutting against the frame, with the belt in the centre of the bed, it is forcing sideways the whole plate at each startup. By doing this, it slowly bring some play into the bearings and plate increasing noise and play, what all users are facing after printing a few dozen hours.

To improve this excessive force momentum onto the left bearing, adding a buffer on the right bearing to have a flat contact of the Y plate should reduce this unwanted lateral effort on the bearings and plate.

This easy upgrade only works when installed on a new machine, or revised Y bed bearing axis.

Size of the bumper - buffer varies from one machine to another. Between two original Prusa machines, I have values for the bumper from 34mm to 36.5mm, check yours!

One is 44 days print time, and the other one is 7 days print time. Play and noise of the 44 days printer is high and not mechanically pleasant.

Once your bumper installed on the right shaft, the open side facing the roof, pushing the bed all the way back, the bed should not be able to move more on one side than the other. If it does, check the length of your bumper and adapt it accordingly.

If there is a way to share modifiable parts, let me know. Otherwise, I've uploaded the drawing dimension for you to draw it at your needed specs.