>> I got the impression that only the guy who originally wrote it understands the actual CAD stuff, and he doesn't work on it any more so the fundamental CAD op

>> I got the impression that only the guy who originally wrote it understands the actual CAD stuff, and he doesn't work on it any more so the fundamental CAD operations are probably fixed now. That was true for a few years, but I've got a pretty good handle on it, as does one of the other maintainers who implemented boolean intersection. I added the helix and revolve (vs lathe) groups, and have fixed a lot of bugs in triangulation and NURBS code. >> The main issues I ran into were no bevels/fillets/drafts, and the fact that small circles become octagons. The octagon issue is fixed - they become 16-gons minimum, and the chord tolerance can be lowered to get more edges. If you're exporting NURBS that doesn't really mater because the actual curves are exported in STEP. As for the other features, I had been working on that here: ]https://github.com/solvespace/solvespace/issues/453#issuecomment-521376948 https://github.com/solvespace/solvespace/issues/453#issuecom... Although my implementation will be strictly for the ends of extrusions and not a general purpose edge modifier tool. I also don't know when it will land. We just keep plugging away at whatever pace we have time for ;-) There have been some new contributors too and some of them even dig in pretty deep.