Solution: When printing filling or supporting, turn the knob anticlockwise in the main interface of the display screen to adjust the printing speed FR100% to 10%. When the printing speed drops, press and hold the extrusion spring clip to quickly pull out the old consumables, and then load the new consumables into the printer (pay attention to the consumables to be inserted in place). Then adjust the printing speed to 30% - 40% to see if it can print normally. After everything is normal, adjust the printing speed to 100%.