These holes make the goal of a “Closed Brep” irrelevant, so the code below this image is too.
spiral_vase_2025Jun24a.gh (40.5 KB)
P.S. I decided to try a thickening technique I learned recently from @martinsiegrist
It leaves some “naked edges” but might make a good lampshade if a printer can handle it? Didn’t spend any time testing tolerance or trying to avoid naked edges, as I did before.
spiral_vase_2025Jun24b.gh (45.9 KB)
Could be “easily” improved by removing holes near edges,?