Anti wobbler with YABB (yet another ball bearing)

I've tried to stabilize z-axis on my Prusa i3 mk8.
The idea was, to use printed materials for that purpose.

The first was to get ball bearings (Lager). I found a lot on Thingiverse, but none, that did fit my needs. It was required, to mount this bearings on a plate on the top of the z-axis, one to the left, one to the right (Platte links/rechts). The bearings were each mounted with 3 countersunk screws M3x12 on it. The center of the ball bearings do have M8 threads to fit the z-shafts.

Then to eleminate the wobbling of the pipe, that was used to connect shaft and motor, I had to replace it by a solid part (Kupplung). The lower side will be pressed over the motors axe, then fixed with a M3 screw. The upper side contains a M8 thread do fit the z-shaft.

First I had some problems to get the ball bearings working. Then I used a M8 nut and a nylon washer to counterfix it from the lower side on the z-shaft. With some tuning I then found a position, where a minimal clearance of the balls is achived.

The wobble is now almost eliminated.

The file Lager.FCStd contains the FreeCAD ball bearing data, the file Support.FCStd all the other parts.