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  1. #3
    I've used 2-core mains cable before now for PSU to stepper drivers - just make sure it's quite thick stuff so at least 1mm^2.
    Also don't wire the drivers power from one to the next to the next... instead use a 'star' configuration so each driver has it's own two power wires going back to the power supply. If you didn't you would need a much larger cable size.

    A neat option for the stepper driver step/direction inputs is to use 4-core alarm cable as this tends to be 7/0.2.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

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