First of all, the biggest problem with these drivers is the potentiometers. All 5 potentiometers were difficult to adjust and the fragility of the potentiometers didn't help. A potentiometer failed completely when the current reading was too low to be used for 46ncm stepper motors on the machine. Two other drivers didn't respond at all and didn't drive a 26 to 65nm stepper motor into a stepper driver slot on 3 different motherboards. But the two drivers that worked worked pretty well for the A4988 driver. Both working drivers are still difficult to turn with a potentiometer. I do not recommend this particular driver set.
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