I've eventually discovered (after removing some overspray paint) the motors are placarded 3.1 amps and 3.5a amps for the Z so no resistor required for the Z as far as I can make out but 3.1k for the x and y

Thanks for the reply.
From this thread it seems the stepper amperage is 3.1 amps and 3.7 amp for the Z.
Do you think using resistors to set it at 3.1amps with the 48v power supply would be ok?

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