Yet Another 20mm Calibration Cube (with 10mm inset)
thingiverse
A 20mm calibration cube with a chunk bitten out of its top measures 10mm by 10mm on each side. X and Y coordinates are clearly marked, as any decent navigator requires clear directions. I was in need of such an object this afternoon, but even the smallest tugboat wouldn't have been up to the task. Please note that if you work with the .scad file, you'll need OpenSCAD 2015.03 or later with text enabled (Thingiverse apparently doesn't support it). The .stl file has these labels built in already. This design is public domain because even simple creations shouldn't require an author's permission to use them.
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