Having changed to a controller with 6 steppers, I have the option to run the pair of z-motors in three ways:

1) In series (per the original kti)
2) In parallel
3) One in slave mode on a separate stepper

I used Nophead's kit from a few years ago, where the manual described wiring the motors in serial.

So far as I know that's because being in serial uses less current (but requires a higher voltage), and that the only advantage of in parallel is higher torque, which is not beneficial on the z-axis.

Just wondered how other people are wiring up theirs on the Mendel90?

mt 2 pence: keep it in series for me. If you wire them in parallel without any positional feedback you run the risk of applying stress if one of the steppers started to skip

In parallel the current is divided by two so you have half the torque, which is not quite enough in my experience.

In terms of keeping the motors in sync parallel is better. If you stall one when in parallel the other stalls as well. If you stall one in series the other continues to spin.

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