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When I disassembled mine, the big gear was also VERY tight against the drive gear. My gears aren't corroded at all though. Batch 2259-3 here
Definitely not a current issue. Looking at the big gear, I can see some misalignment, like the gear isn't square to the face of the motor.
Got my Hemera from Filastruder and managed to get off some great 5+ hour prints, but for no reason, my gears have started seizing. I've ruled out...