I've been experimenting to see how the price of a model differs if it is solid or hollow, but I've hit a snag. It seems there is another step necessary when shelling out a model in Solidworks for 3d printing because of the models I've uploaded ( a simple cube, in a 1cm and one inch size) both prices were the same. However, on another model I extrude/cut a hole in the base of the 1in cube(with a 1cm wall thickness) and then closed that hole with an extruded wall to create a 1in cube with a 1cm wall thickness. This worked! Any thoughts?