Upgraded from a NEMA24 to a NEMA34.
Before going out and milling or buying it in metal it is always a good idea to testprint it.
Probably will use the plastic part for a while as 3mm wall-thickness PETG seems might already be good enough.
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Shaft diameter and length is also part of it.
NEMA is just a mechanical aspect and contains zero information about the performance. Equally comparing motors by torque isn't the full picture as the inductance (and other aspects) can be different. Equally important is the stepper-driver & supply voltage.