Gap Thickness Measurement Blocks

I made this to ease getting measurements for an earlier model. Basic gap/thickness measuring tool for approximating the width of a gap or hole. Measurements are in millimeters. May also be useful for testing printer calibration.

**Notes**

I printed this with a 0.4 mm nozzle and 0.1 mm layer height. It might also be printable with a 0.5 mm nozzle, but I haven't tried. Nozzle sizes larger than 0.5 mm will likely render the number labeling unreadable.

**v004 Update**

Cleaned up the geom