The stepper driver was initially set to 1.319, this is too high and will over heat the stepper motor leadign to loss of toruq and a decreased lifespan.
By rotating the potentiometer, in this case clockwise from the potion I was in you can decrease the VREF.
Please note the direction of turn to decrease may be different depending on the manufacturer of the stepper driver so always double check by rotating a small amount initially.
It can be difficult to get the value spot on, It's better to set the VREF slightly lower than it is to set it slightly higher.
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