hmm not sure how that would work, a lattice structure works on a 3D printer because that material is rigid almost as soon as it is printed. So upper layers can "float" given a few support points. Most printers that can do 2.5D are using liquid ink. This means layers wont float, they would just coat the previous lattice work. In my last reply there were some stained-glass looking ornaments, they're printed with texture pattern in clear, that was then overlaid by a full layer of clear - you can see that the top layer will just coat the lower layers because there is no way for it to cure in mid air.