Guided TUSH remix for Ender 2 PSU

I modified the very good TUSH remix from https://www.thingiverse.com/thing:2427540

I added grips to it so it can fit tightly on the Ender 2 PSU which needs to be close to the printer anyway (unless you modify the cables). At least it now serves a purpose, and I can remove the big 1Kg spool from the top of the printer :). The center of gravity of the printer is way lower now, and I can install a Z-Axis stabilizer.
I included a 6mm and 8mm version so you can use normal 608 bearings or the ones