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1.Users can change their own motor drive, support 4988 drive and 8825 drive, TMC2100 drive.The external drive signal is reserved, and the 57 or 86 motor can be driven by a large external drive.2.The stable and reliable filter circuit greatly reduces the possibility of interference, and the most likely to avoid the phenomenon of dead machine and running in the printing process.3.Plug the driver according to the different color terminals,to avoid the damage caused by the reversed connection.4. Please do not insert or pull the motor and driver under the condition of power-on, which may cause the driver to burn out. Also do not adjust the current during the operation of the motor.5.You need first disconnect the power, remove the motor, and then re-power, adjust the potentiometer, measure the voltage on the potentiometer until the measured voltage is the same as expected. Do not insert the reverse drive, otherwise it will burn out the drive and even burn the motherboard.