Summary

This design is a printed rotational stage capable of a positioning accuracy in the order of 10 micron. Besides 3D printed parts it uses a 6200 and a MR95-zz ball bearings, two springs and M3 bolts with nuts and hot melt inserts. The complete fabrication process is described in an instructable: https://www.instructables.com/Build-a-3D-Printed-Rotational-Platform/

I have a quick demonstration video here: https://youtu.be/pMDN6k8GMak

I also designed various linear stages and a micromanipulator compatible with this model, all the files and building instructions are available here:
Linear stages:
https://www.instructables.com/Build-a-3D-Printed-Linear-Stage/
https://makerworld.com/en/models/485262
https://makerworld.com/en/models/485267
https://makerworld.com/en/models/485272

Micromanipulator:
https://www.instructables.com/Build-a-3D-Printed-Micro-manipulator/
https://makerworld.com/en/models/478650#profileId-389899