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Thanks! I'll spec a new motor and ESC and figure out how to adjust to it once I have it.

I just test-printed the rotor, and one area that strikes me as weak is the central disk - in between the 6 holes for the tubes. It is so thin that any lamination issues and any weakness due to infill structure would be exposed there. I wonder if there's a way to adjust that design? Maybe printing the bottom 10 layers solid, then having infill for the rest... You don't want too much mass up above! (do you? I'll explore the physics)