How do I remove this edge trim? untrim and delete edge commands not working

Single surface patch. I relay want to keep the outer edges do to the complexity or retrimming it with all the alterations done to the surrounding surfaces since its creation.

Shell patch test.3dm (2.8 MB)

Any other tips on simplifying complex surfaces would be realy appreciated. Thank you.

I’m not sure what you mean - why untrim if you want to keep the edges? Try Untrim with KeepTrimObjects=Yes, modify the resulting curves and retrim… maybe?

-Pascal

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