I saved it in Inventor as a step file and it worked perfectly, thanks for the help.

I am trying to set up a toolpath for a solid object originally created in Autocad Inventor. the solid object is a bottom side of a skateboard for a skateboard press. the other side was directly imported and CNC'd with no errors or problems but whenever i try to set up a toolpath for this object i get an error reading: Unable to extract (at least) one solid face. I imported it as an stl. and am stumpted. If anyone has any ideas as to what the problem could be your advice would be greatly appreciated.

I am trying to set up a toolpath for a solid object originally created in Autocad Inventor. the solid object is a bottom side of a skateboard for a skateboard press. the other side was directly imported and CNC'd with no errors or problems but whenever i try to set up a toolpath for this object i get an error reading: Unable to extract (at least) one solid face. I imported it as an stl. and am stumpted. If anyone has any ideas as to what the problem could be your advice would be greatly appreciated.