Yet Another 20mm Calibration Cube (with 10mm inset)
thingiverse
A 20mm calibration cube with a 10mm cube chewed out of the top. X and Y axes are labeled. I needed something along these lines this afternoon and a little tugboat wasn't going to do the job. Please note, if you work with the .scad file, the labels require OpenSCAD 2015.03 or later with the text feature enabled (Thingiverse apparently doesn't, as you can tell from the preivew...). The .stl has this baked in. Public domain, because trivial things shouldn't require you to bow down to a guy who wrote seven lines of code.
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