8mm Bearing with lm12uu OD

Designed these for use on NikodemBartnik's Dremel CNC. https://www.thingiverse.com/thing:3004773

I had 8mm rods from a previous project and didn't want to buy 12mm rod.

I found that the bearings were a little too tight fresh off the printer.

to solve this I actually ran my t8 threaded rod in them and moved it back and forth a few times and now they slide freely with little to no play in them.