Hole Diameter Tester

As you all know, 3D-printed holes usually come out smaller than designed.

This Thing consists of 10 holes designed with diameters of exactly 10, 9, 8, 7, 6, 5, 4, 3, 2 and 1mm.

Print it out and use calipers to see how much shrinkage your combination of printer, slicer and filament gives at each size. Or use the print as a guide to see which hole fits perfectly over a particular screw or shaft, so you know which diameter you need to use when designing.

It's small and thin so it prints fast and uses minimal material.