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Mike, be careful, the A4988 have different current shunts and therefore, the reference voltage you measure on the trimmer might cause different current settings. Search for Ramps 1.4 wiki on Google, there is a section regarding the different StepStick’s and the formula for calculate the motor current out of it. The trimmer’s are used to adjust the reference voltage for current measurement on the A4988:
I had the same issue with the A4988 stepper driver, that those got too hot, so I changed to the DRV8825, which have a 4-layer PCB, which has a better thermal design. I’m using the DRV8825 without any active cooling and they don’t getting hot at all… Even with motor currents between 1A and 1.4A.