The orientation of the drivers is really important. You are going to fry the drivers if they are inserted incorrectly. Remember to always have all power turned off, that includes any USB, whenever you handle the drivers - aside from adjusting the vref.
The A4988 is inserted with trimpot facing away from dipswitches.
The DRV8825 is inserted with trimpot facing towards the dipswitches.
SilentStepStick TMC2100 is inserted with trimpot facing towards the dipswitches.
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