3 Cylinder Air Engine

An "all" printed compressed air engine. I have ran it up to 80 psi, the only issues are that the hoses pop off, and the bearings occasionally pop out. (-1% scale should resolve this)
1.6mm metric hex cap screws and matching nuts
30mm long m3 screws to secure to base
40/45mm m3 screws for valve lifters
small m3 to secure a fidget spinner to the crank, acting as a harmonic balancer.
skateboard bearing- loose press fit.
Crankshaft pieces should be printed vertically using floors and roofs.
Does not use any springs, relies on gravity/pressure to close valves for minimal resistance.
printed on .2 mm nozzle with .1 layer height
O-rings are from dorman part# 799-451

*Edit* This engine does not require springs below 60 psi. If you plan on using higher pressure a typical pen spring cut in half and slightly stretched will be sufficient, otherwise you will stay encountering valve float issues.

running: https://youtu.be/S18prY_3BXY
assembly: https://youtu.be/9ZK1R5aZ-lg

can no