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I had massive issues with the whole thing not spinning freely. I think one or more components weren't printed on a level bed or my printer is off slightly on an axis.

To get the LPT spinning freely I

  • Reprinted the spool, turbines and aft shaft 2% smaller on the X/Y axis
  • Reprinted the stators a few % smaller on the Z axis.

This allowed plenty of clearance for the parts to move (and the shaft still fit snugly in the bearing) but once the rear nozzle was attached it pushed the whole assembly too far forward within the case and made it completely jam up against the stators. I added a few washers as spacers between the nozzle and the LPT casing and that fixed it. I think you could possibly do the same by shaving a % or two from the shaft maybe?

I also had to do the same at the other end with the HPT and the combustion stage (spacers between the casing). The LPT section spins freely but there is the slightest of rubbing somewhere on the HPT stage, not sure where I can't locate it but it does spin reasonably well still!

Nice design though, looks awesome!