I want to print a project box for electronics. It is hollow in the center. The walls are about 1.5mm (I forgot the exact measurements right now). I was reading in the document that one can control how many layers are solid before the printer starts a partial-fill pattern. I see the outer perimeter shell feature in the machine controls. Since this is a hollow box, and not a solid, how do I make sure there is 100% fill? Do I just specify enough layers of shell to exceed the thickness of the wall? Do I turn the partial-fill mode off? Again, I want the walls and floor to be 100% filled in.