Correct, we don't have an official size right now. The major limiting factors are the maximum angle of deflection of the mirrors, the distance from the printer to the print area, and the desired resolution. Since the mirrors direct the laser through an arc, moving it further away from the print gives you a larger build area at the same amount of deflection, but this also means that movements are less precise (the light moves more for the same amount of input) and the spot size of the laser gets bigger. Theoretically there is no limit to how big you could build something; practically, it depends on your time and accuracy requirements. The prints we made this week were quite small compared to the distance from the printer, but we fully expect that to get better as we fix the memory in the mirrors, make the mirror itself more sensitive, and add the amplifier.