Hey all, I have created a simple exhaust clamp that I would like to unfold to be able to send it to a plasma cutter.

Here is a picture,

When I insert a base flange from a simple sketch, turns out I cannot unfold it, it tells me that the elliptical faces can not be unfolded. How is that possible??

If anyone could help me that would be greatly appreciated. Seems like such an easy thing to do, I was surprised I couldn't.