When you see that the belt of X and Y axis is loose and elastic when you touch it with your fingers, you need to tighten the belt again.
Adjustment method: loosen the 4 screws on the belt of X and Y axis, then push the extruder back and forth on the X axis slowly until the belt is tight, then you can screw back the screws.
When you play for a period of time, use your fingers to press the two ends of the belt, feel the tightness of the belt, to make appropriate adjustments (the force between the two belts just contact can be)
Adjustment method: use 3mm Allen wrench to turn the 2 screws next to the belt.
Clean dust and debris every six months.
Replace the activated carbon filter every three months.
Replace if worn to maintain temperature stability.