Old... I remember lego printers being advertised in the one mindstorms book back in the year 2004. Infact this looks mostly identical to that design. However id does seem he did not use the mindstoms to interface with it which is impressive. Basically it seems he wired the whole damn this himself by designing all the components. The only impressive part was that huge pile of electronics which powered the printer so it worked like a normal printer via USB or what not. You should see the lego rubic cube solver.