I have been working with Sketchup and Shapeways for a little while now (3 weeks.) I just finished working on a model that is not too large in my opinion, being 1.6in (4.1cm) x 1.6 x 5.9 cm (2.3in). When I originally downloaded it the sides were a little thick, at .0625 or so, even so I was shocked to have the price in ultra frosted detail at $266! Well, this model is essentially just a glass as the bottom is totally open. I spent time thiining the walls down to just .012in or just a hair over .3mm and when I uploaded the model it cost even MORE money to print $275 for FUD. Can someone please help as everything that I have says the model is hollow, but Shapeways apparently doesn't think so.