Got to revive this thread.
The undercut removal tool is just barely usefull for manufacturing purposes.
It would be greatly improved if the devs could make it multithreaded, added a parting line definition function with deviation parameters, and a tool specific shader that could show a draft analysis using the defined vector and angle. I would settle just with making it a bit faster (multithreaded) for starters, which could be done by letting the tool handle voxel cells in parallel, but I'm no dev.
Is there a way to make this an official bugfix or feature request?