Somethign I htink would work very well for the digital range is WW1 Tank crews. On one hand, everyone likes tanks, and there are now some very nice 28mm tank models available, so include a really good Renault file that is free. Which is why I went looking for some WW1 French and US tankers. But it strikes me that no one will buy boxes and boxes of tank crews, but most everyone into WW1 will end up with some tanks- and any of them with a 3D printer is going to make at least one FT. Hence there is a need for small runs of these figures, and no one else will probably make them. Even for the FT you could do an open hatch woith commander that could be put on the current (free FT) model. Even if you never use the figures in a wargame, it would be very nice to have a few crewmembers to stand next to the tank when it is on a shelf.