1. Turn on the machine, preheat the nozzle to 200 degree, unload the filament in settings by clicking "change".
2. Power off, turn around the machine to the right side, which is convenient when dismantle and install the parts. hold the edge of quick fit, pull out the feeding pipe.
3.Remove the wire of extruder motor, dismantle the filament sensor, and remove the motor's screw.
4. Install the new extruder, please be careful when installing, the motor wire connector should be downward and the quick fit is upward.
5. Make everything dismantled back to its original position.
Here is the video link: https://www.youtube.com/watch?v=kmFIIEHlKUM