Stop loft of 3D curve when loft self intersects?

I have a 3D curve that I’m trying to extrude. During the axis extrusion, there is collision where the line double backs on itself creating surface.

I’m ultimately trying to mill this piece on a lathe, however this ridge adds material to the true model.

Is there a way to restrict the loft so it does not create a surface in the closed loop portion?

I have attached my .gh and a picture of the physical milling the model to help show the issue.

11.06.2021_08.23.59_REC (13.1 KB)


Maybe like this? (21.1 KB)

This got me very close to what I needed.

I just created a patch surface from the section that didn’t extrude, merged the two and got exactly what I wanted.

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