Probably no reason. But are you suggesting that we also use 3D printers to design, manufacture, and debug PCBs? I don't think cases are the limiting factor in neo-Amiga designs.
(On this note, I wonder if there's any comparison out there on 3D printer cost-effectiveness and how it scales with quantity, as compared to a full-fledged molding operation; all the nerds are getting their panties moist over the fact that it's possible, but nobody ever seems to mention whether it's especially practical.)
