That is so neat. I built something a little bit like this for a simulator of a 3D portal mill. Trying it on real wood got expensive fast so for debugging runs and trials of designs I would run a simulation where the toolbit would hack out the shape out of a three dimensional array of voxels. This was then displayed using a very simple engine built with PyGame. I got a lot of use out of that and it saved days (and a small forest).

Great to see something along those lines but with much better visuals.

That's an interesting application! I'm excited to see where these kinds of projects go now that we have so much computing power.