Did you put three jumper pin caps under each stepper driver board to set your micro-stepping? Sainsmart doesn't ship them with their kits, and without them your micro-stepping is set for 1/1 and not 1/16. They also do not sell the A4988 stepper drivers with any semblance of adjustment on the current adjuster potentiometer, so break out your multimeter and set them to 0.4V if your kit also came with their stepper motors.....
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