1. If the feeding gears were wrapped with debris of filament, they need to be cleaned for maintenance.
2. Take the extruder assembly off the machine. (the cable support hot-plug)
3. Remove the 4 screws on the transparent cover with 1.5 mm Allen-Key and remove the cover. Figure 3.5-1
4. Carefully use a tweezer or little plier to take the right idle gear out, then clean the driving and idle gear with a hand-air-blower or else. (The left driving gear is fixed) Figure 3.5-2