DVD / CD stepper slider unit

Inspired by this thing:
https://www.thingiverse.com/thing:1765496
... designed from scratch on Onshape.

I added a second guiding rod. The moving part is guided 100% on one rod and only 180° on second. It can be tightened to second rod with a cable tie. This allows for fine tuning of printing tolerances.
I run a drill bit of 3mm in the guiding holes until they moved smoothly.
3mm guiding rods, stepper motor itself as well as the screws holding the stepper in place are salvaged from old DVD