small hole calibration brick.

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.