This started to be a test with the capabilities of designing simple stl files with gemini.
I needed a set of these for another design ...
I wanted some small "cards" that can be fitted on a key chain - with just some basic measurements:

the design includes two "sets" with 6 plates

File 1:
2* 10 mm
2* 12 mm
2* 15 mm

File 2:
2* 17.5 mm
2* 20 mm
2* 25 mm