I am a student working on a school, club project on Inventor 16'. My club is creating a grill that looks like a football helmet. I have a model of the grill as a sheet metal file, however I can't get the flat pattern to work correctly. This may be due to the fact that I started the project as a regular IPT and converted the project into a sheet metal file; consequently there are no physical bends. Do you need bends in order to make a flat pattern? Thank you for your time and advise.