That means compressed air, and that means a pressure vessel. Since just about everything else on this robot is 3D printed, they asked the obvious question.

The Pilot 3100300 Vertical Compressed Air Storage Tank is part of our range of vertical air receivers for compressed air storage. Custom built and horizontal air receivers are also available. 300L ...

I have such a tank (from Home Depot, probably the same as 1966Ford's) and I also made an adapter to fill it off my dad's compressor, because the Schrader valve was a pain to use.<BR><BR>If I were ...