Such is the case with this 3D-printed compressed air engine, which just keeps getting better. The design has changed a lot since we first covered [Tom Stanton]’s attempts at reviving the ...

Compressed-air engines had been used in some locomotives and trucks since the 1800s, but Miller streamlined the design for his Air Car One (left). Pressure generated by the release of compressed ...

Compressed air isn’t really a practical ... with a lightweight regulator of his own 3D-printed design. His latest ball-valve air engine was then designed to run on this lower regulated pressure ...