When extruding the filament, the gears need to rub and engage the filament, which will produce waste in the process. With the accumulation of waste filaments, the friction between filament and gears decreases, and the extrusion efficiency will also decrease, or even cannot be extruded. In addition, accumulated waste filaments may fall into the nozzle and jam it. Therefore, you need to clean the gears inside the extruder regularly.
