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How to unbend twisted sheet metal part


Hi there,
I am trying to unbend a twisted sheet metal part. DXF from "Save as Flat" works, but not "Unbend".
I created the piece as bounded surface in part using keypoint curves and lines. Added thickness, opened in sheet metal and converted to sheet metal.
Need to add perforations to the sheet yet, but don't know how to proceed.
Any pointers are greatly appreciated.
P.S. once I figure out how to upload, I will add the file.