I am trying to Thicken the surface for a Drill Side Housing model I have created. I need it to be 3mm, ideally 1.5mm on the inside of the surface and 1.5mm on the outside however this isn't a massive issue. I have tried converting it into a solid then using the Shell command but this fails as well. I think it is the curvature of the model that is causing these features to fail. I'm not sure how I can rectify this problem.
Any help/ advice would be greatly appreciated!