Dual Z motor not staying together at rest
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Have you worked out whether your driver supply voltage is high enough to maintain torque up to your target speed? See https://duet3d.com/wiki/Choosing_stepper_motors#How_to_work_out_the_power_supply_voltage_you_need.
I read through that but got lost with the fact that I'm running direct drive lead screws on the Z axis. Not using belts.
I'm currently at 85% of the spec 1.5a the motors are rated for. I've tried more and less with the same results.
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One more question. When you set a value for the Z motor current, does the board provide that figure to each of the Z motors or does it divide it between them?
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If the motors are connected in series (as the two Z motor connectors on the Duet are wired) or to separate drivers, they each get that current. If they are connected in parallel, the current is divided.
