Take out the 2.0mm L-shaped wrench from the accessory box and loosen the four screws that hold the motor.

Belt tightening： Hold the motor by hand, pull the motor backward to keep the Y belt tight, and then tighten the four screws.

Loosen the belt： Hold the motor by hand, pull the motor forward as a whole, loosen the Y belt slightly, and then tighten the four screws