Please apply an appropriate amount of grease to the lead screw and control the motor to run up and down several times to make the lubricant adhere evenly. Please try to avoid using lubricating oil, as highly fluid lubricating oil will flow along the motor lead screw to the inside of the motor.
Please use the hex wrench in the tool kit included with the printer to check whether the screws of the anti-backlash component are loose.
●Z-axis motor replacement guide