My favorite features are
- The glowing indicator light made from a uranium-glass marble flanked by six high-power UV LEDs.
- The fact that it can flip itself over and run upside-down just as easily as right side up.
Most of the external metalwork was done by Mr. Lindsey, but he used Big Blue Saw to make the internal frame. He writes
The primary chassis of the robot is made from a single piece of waterjet-cut steel plate from Big Blue Saw. I was originally reluctant to order parts made for the robot as I wanted as much of it as possible to be hand-made, but having parts custom-cut turned out to be a very good idea. I was able to get some very complex and organic pieces of metal made with great precision, which eliminated issues with servo alignment in previous versions.