On each motor driver there is a voltage adjustment dial. NEVER turn the dial while power is connected or you will kill the driver.
In the bottom right corner is the GND pin.
A multimeter can measure the RMS current between these two pins. Ideally the RMS Current = Peak Current x 0.707. For a 0.3a stepper motor the RMS current would be 0.21
Measure the RMS current; turn off power; turn the dial 5-10 degrees. Repeat until the RMS current is correct.
Test your machine again to ensure smooth moving motors that do not get very hot. (they will still be warm to the touch.)
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