_OffsetSrf the blue srf by e.g. 4.
There shouldn’t be such a result, better no result with a “failed” info.
2024-09-30_Offset-3.9.3dm (1.3 MB)
Rem:
I don’t need a geometry solution for this example.
the singularities are causing the issue.
if you were to overbuild this, then offset then trim it to this shape , you’d get a much better result.
I’d also offset loose= yes, unless you need super high accuracy