If you start to notice layer shifting while printing, it could be caused by one of two things. The first would be to double check that the electronics case fan is working and actively cooling your stepper drivers. If the fan is still working, the next option would be to increase the stepper driver current going to the stepper motor.
If you would like to follow a more technical way of adjusting a stepper driver, you can follow the instructions laid out on Pololu's website. Here is a link with instructions on adjusting the stepper drivers using a multimeter.
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