This is a batter cover I actually printed with my Dremel 3d printer  after designing it in Cadkey for my class from their workbook.

I saved drawing in .stl format.

I opened it in mesmaker, I exported-saved it in. stl format again.

I opened it in dremmel software, rotated flat then scaled it and put it on the platform then I selected it and saved-build it in their format .g3drem.

I had it do it severl times but it ist is possible using this method  email me for help I can talk over the phone better to help a beginner like me to print a design.

You can also use CAD like CATIA at a college, pretend you are a student most do not check, other students will help.