The stock extruder will wear over time and scrape your filament along the way. This extruder solves that issue. This all-metal extruder has an adjustable spring to increase or decrease tension on the filament. Overall, it is a much more robust part. The advantages of a metal extruder is you have stronger pressure pushing the filament into the printer nozzle and so will improve on the printer’s performance. This all-metal extruder is a great update for All Creality printers such as the Ender 3, Ender 5, CR-20 Pro, CR 10/S/4/5. No firmware flashing required, easy installation, stable and durable.