small hole calibration brick.
thingiverse
This thing is a hole calibration for openscad users. the command used is { cylinder( r = x ); } with x having values from 1 to 2 in 0.1 increments. Lets you know what the real hole size is on a print . handy for fitting screws , bolts or shafts . Fast small print , handy on the work bench.
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