Laser Metric Gauges

This is my very first design submission... three super simple, very basic Metric Gauges. One of the many tools in my shop is a Laguna PL12|20 40W laser... it's three optimum focal length settings for etching and cutting are 5, 7, and 9 mm. Tough to find gauges these sizes without spending big money on a complete sets of metric gauges.

I found that when I printed my original design, which were printed flat, they printed at 4.1, 6.1, and 8.1 mm thick, but the length and width were fine. So I printed these on their side... much better!

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4VdWSukKiEz