Gently press the belts on the X-axis and Y-axis motors to feel the tightness of the belts. If the belt is in good condition, you will feel the obvious rebound force. If not, you
need to adjust the belt. Through the adjustment knobs at the ends of the X-axis and Y-axis, the tightness of the belt can be adjusted. After the adjustment, slide the nozzle
and hot bed to check whether the movement is smooth. If the movement is not smooth, the belt may be too tight and need to be adjusted loosely.