Naturally, having debugging support in FreeCAD would be better, but this is a pretty handy hack to get you most of the way there. FreeCAD has gotten a lot better in recent years.

Deliverables A Python addon will be written, that exports a parts and assembly definition for input into HIPAIR. Because FreeCAD is widely used, configuration space visualizations produced from ...

Scriptability in Python, real open source software, and all of the bells and whistles for free. Now that its two biggest pain points have been addressed, FreeCAD has become a lot easier to love.