System information

SolveSpace version: 3.0~201e15e6

Operating system: Debian testing/buster

Expected behavior

The result of "show naked edges" suggests the model is fine without forcing to mesh. I would expect the export to also complete successfully then.

Actual behavior

On export as mesh without force to mesh set for this group, get a self-intersecting warning (on an extrude cut through a lathe cylinder-ish thing.)

Turning on the "force to mesh" setting allowed the export to complete without the warning.

Additional information

If this is just a "model too complicated, just force to mesh" issue, feel free to close, sorry for the noise. Just seemed weird that it would look OK via one tool but then export would complain, so I figured I'd submit it as long as I already remembered how to use the screencast tool. Pretty sure this isn't exactly #171, since the sample file there shows the warning interactively (turns red) and using Show Naked Edges, not just on mesh export. (and I've gotten pretty good at dodging that issue over time.)

The file itself:
screwdriver-sheath-with-taper.zip

Screencast, showing behavior and workaround.
slvs nurbs.zip