Update - Jan 16 2026

added V2 as a download here, too. It has its own “page” I made before I knew as much as I do now… which isn’t to say I know anything.

V2 adds tic marks at the “hours” so you can make sure you’re getting a straight line measurement from side to side at multiple angles to verify which direction your printer is potentially “off” at.

I was having a lot of trouble with prints that weren't the correct measurements and found that my Mainsail printer.cfg had improper delta radius set for some reason.

This ring is 2.0 mm tall with an outer diameter of 50 mm and an inner diameter of 40 mm.

As it's purely intended to measure dimensional accuracy, I didn't worry about infill or other settings when I printed it. I basically printed a shell with only about 5% infill so it would be a quick verification tool.

I hope this helps someone else.