Monoprice Select Mini X axis support 8MM bearings

I was trying to do some larger prints that required some heavy head movement on the far end of the X axis. The minor slop in the unsupported arm of the Select Mini started to show its weakness and left me with some layer issues. Time to make the X axis support gantry.

Only problem was, all of the good Things were designed for 6mm bearings and I only had spare 8mm rods and bearings. So I remixed it in Blender, added 2 30mm fan slots for future upgrades.

It is still designed to go on top of