Will, I do all my stuff in OpenSCAD already :)
Like these knotty designs:
https://www.instagram.com/p/C3ZE496Liz7/
I procrastinated on getting into Rhino/Grasshopper because it's not FOSS, and now that I'm about to join the computational geometry team of a competing suite specifically focusing on parametric 3D for manufacturing, it might take even longer :D