Our school was recently given a 3d printer from NASA. (Thanks Nasa!) As a little test of the resolution of the printer, and to learn how to use the software, we decided to print out our CAD of our robot. This is the largest size object that it can print. It is approximately a 8.33 scale.
So, the dimensions are 6" tall, ~4" wide, ~3" long.
It is made of ABS plastic, and took 33 hours to print