dEarring#87: Micro (b)earring 12mm (works!)

There are several tiny bearings on thingiverse, and I also made an earring featuring pp3dp's bearing, but it was a little bulky: http://thingiverse.com/thing:7127

As the small ones found here usualy need to be assembled, and downscaling the others will not work out, I made one from scratch.
Suprisingly, even 2mm balls print fine. But they kept falling out, even after changing size and depth of the bearing rail.

The 5th try then has a flat plate on top and on the bottom.
As the limit