BTW: Here is how i did the rectangular hollow in BOLTS:bejant wrote:To make the inside radius equal to the wall thickness, create a Construction Geometry (blue) line segment from the center point of an inside arc to the endpoint of the same arc, then apply an Equality Constraint between that new line segment and the existing Construction line segment.

https://github.com/jreinhardt/BOLTS/blo ... low.py#L23 and the drawing here: http://www.bolts-library.org/en/parts/n ... ofile.html

Ahh and the radius definition according EU: https://github.com/jreinhardt/BOLTS/blo ... low.py#L30