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It is pretty sensitive take the decimal further. 0.46v for the z, 0.93v the the others.
So now the cool part is you can over drive the hell out of the the steppers, if you have a fan or 2 on the drivers, so it is kind of an art. I would set them a bit low, .42, .85 and see what temps you get. The steppers can run at up to 100C (usually), although I would never do that. I run them at about 30C or less. I don’t like to push things too far so I ship the boards set at .42 and .7, no fan needed.