Disk Drive Integrated-Bearing Tripteron Demonstrator

This is a miniaturized version of the Tripteron platform designed to use integrated bearings (using copper BBs) and disk drive motors.

It's useless for actual use, because there's more play in the integrated bearings than in the whole travel of the disk drive steppers. I'm working on a V2 that will use real bearings, which means reverting some parts of it back to apsuity's original design, but keeping the rod mounts.