I can't flatten this surface

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I want to be able to flatten this surface into a parametric arc shape. I’ve tried smash, unrollsrf, unrollsrfuv, squish, and flattensrf, but none seem to work or flatten the surface by a very small amount.Parametric Surface.3dm (41.3 KB)

It seems to be a doubly curved surface and that’s something you cannot unroll. Unless you increase the tolerance.

If you want more help, post a file with the relevant geometry.

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