For K1/K1 Max/K1C Ender 3 V3/Ender 3 V3 Plus Extrusion Kit. The shell of K1 extruder is made of plastic, and the extruded gears inside are made of metal material, which is sturdy and durable, achieving better creativity High-speed and Smooth Feeding Dual-gear direct extruder, delivering 50N strong extrusion force. By combining the motor, the filament is smoothly fed in and the printing effect is not affected under long-term high-speed printing conditions Dual Gear For Stable Printing The K1 Max extruder with dual gear drive does not damage the filament, supports stable, smooth and precise filament feeding For Creality K1/K1 Max/K1C Ender 3 V3/Ender 3 V3 Plus Extruder works well with different filaments like PLA/TPU/PETG/ABS etc. Multi-material capability enjoys more creativity