hole size checker

When 3D printing I often find that hole sizes will print smaller than they are in the file due to the resolution of the printer. This thing features holes from 1mm up to 8.9mm in .1mm increments. This will allow you to choose the correct size hole for your print.
The millimetre hole size is printed along one side of the square and the .1 mm increments along the other side. Simply match up the two you need to get the size the hole was in the model file.