At 90 PSI the 3d printed plastic parts are undergoing 1300 lbs of force. They'd pop right off the pipe at probably around 300 lbs. Yet, PVC pipes are used for dangerous (but working) rocket engines and the nozzles don't shear away from the pipe (every time).

A 12 ton pneumatic jack will only cost me $80 at home depot though, so I may do the testing with the jack while I figure out the 3d printed cylinder. I may forego the 3d printed cylinder in favor of a $180 metal cylinder, but that would set future build costs at a $360 minimum before fittings, framing, etc.

Priority #1 is making a working heater. I will order 38 gauge NiChrome and a lamp dimmer tonight. The shipping time will give me time to research insulation materials.