Ultimate Multi Test Calibration Cube

Updated 16/04/23: As per feedback from avx I made the top and side circles deeper for easier measurement. 

If anyone has further ideas on what to add to the test let me know.

This is a multi-test calibration cube.
Tests included:

1. Standard Cube 20x20x20mm
2. Bridging
3. Overhang 45, 50, 55, 60
4. Vertical and Horizontal Hole 15mm
5. Retraction
6. Text