Contextualizing this, I am making some kind of trumpet shape for 3d printing, so it will require iteration. That makes a grasshopper model worth it, so here I am. I’d like to sweep an ellipse through a parameterized, filleted poly line so that I have an elliptical tube with some sliding scales to tweak it.

However, I am running into enormous difficulty getting each of my sweep curves to be included in the sweep. Either one of two situations is happening:

- I sweep through N-1 curves as defined by my parameters, and sweep to a singular line at the end.
- I produce ellipses at each of the PFrames including the end, but Sweep-1 will not calculate.

I am really running up against a wall; I don’t understand how to get this Sweep to evaluate. I’ve included my grasshopper file and an image of the problem:

trumpet.gh (9.2 KB)