>>>  Updated to V2. more consistent channel clearance (see sketch image). 0.4 stamp is also moved to bottom now for consistency with other dimensional stamps. 

It's my take on tolerance test. It's a tolerance test with a taste of fidget spinner. It includes 0.1, 0.15, 0.2, 0.25, 0.3, 0.35 and 0.4.mm in the middle. Tolerances are very close and consistence throughout the channels so it also proofs if your printer is calibrated to the print the height you have chosen. 

For instance, If you are printing with 0.2mm print height and your Printer is calibrated so every knob 0.2 and above should rotate. If you are printing with 0.15mm print height and printer is calibrated then 0.15 and above should rotate.

If you are printing with 0.2 print height and 0.2 doesn't rotate you need to calibrate your printer so on and so forth.