These work very, very well; very smooth, straight, and powerful. My machine uses 2 Z-steppers, so I had to increase the max. current on the driver, and add a heatsink. A note to Repetier users: The leadscrew calculator lists a T8-2 leadscrew, but the value this calculator returns must be divided by 4, for example, the motors are a 1.8 degree step, and my driver is set for 1/16 step, giving 3200 pulses per revolution. On these 4-lead screws, 1 revolution gives 8mm of travel, so the correct Z-step setting is 400 pulses per mm. Hope this helps.
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