In 2015 David Gaylord posted a Matterhackers article on creating stencils. As a newbie, I am a bit confused about the layers. There was a discussion on how much infill to use. But we are trying to make a thin, solid sheet of plastic with cutouts, so why would there BE any infill? Should I set it up with 4 "bottom" layers and no "top" nor "infill", two top and two bottom, or what? I tried 100% infill, but that generated an infill error.