This is a tool that helps measure inner and outer radiuses. It comes in a nice little box with 40 gauges, ranging from 1mm to 40mm.

The box has a lid that slides onto the box. Small magnets will ensure the lid stays closed.

Prerequisites

1. 6 magnets sized 8x1.5mm (optional).
2. Super glue.

Assembly

The assembly is straight-forward. Only two things:

1. The size-tags that go on the sides of the box need to be glued on.
2. Use 3 magnets for the lid and 3 for the box. Give them a little glue as well, so they stay put.

That's all. I hope you will enjoy it.

Feel free to contact me if you have any questions.

Update (10-01-2026)

Added a new print profile for a Gridfinity base