A circular sheet metal part contains some holes (cut extrude 8), however when I wrap the part using the flatten command the holes are greyed out and no longer show within the part. They re-appear when I flatten the part.
I'm missing something but it is not obvious, any tips would be much appreciated.
Basic example attached.
Oh yes, instead of flattening and cutting from that, unfold the bend, cut, then fold again. (the fold and unfold sheet metal feature commands)