i dont know of what material was used. but that is forgeted up awesome lol
I've heard that 3D printers generally use a plastic that has similar consistency to that of lego bricks-- so uh, if you plan to make lego, you're in luck. :3
not specific to the OP link, but interestinghttp://www.youtube.com/watch?v=C3_twsI4VG0apparently you can even print stainless steel?i didnt think that was possible. i couldnt imagine the cost of material though