Power on the printer, go to the main menu, click on "Settings" ➞ "Move" select "50mm" as the unit, and click the "Z+ Up" to raise the Z-axis to the middle height.
Return to the main menu, click on "Tools" icon ➞ "Filament" icon and finally click "Extrude." The nozzle will automatically heat up to 210°C.
Once the nozzle reaches the target temperature, you could press the handle on the extruder to push a small amount of filament, and then quickly pull out the filament. Follow the steps in the figure below for sequential operation.
Reminder: When replacing the cooling fan, perform a filament retraction. Wait for the printhead to cool before proceeding with the replacement.
Before proceeding with the replacement, make sure to turn off the printer and disconnect the power to ensure safe
operations.
Rotate the left Z-axis motor coupler clockwise to lift the Z-axis to the middle position as shown in the figure.