I am trying to make a tray with .050" walls. I do not want a flat bottom all the way across. It should follow the contour of the dividers. How do I go about this? I started extruding the sides and realized pretty quickly that it would be a lot of work to make all of the intersections work out right. This item is to be 3d printed, so I am trying to use as little of plastic as possible by eliminating the open areas.