Creality Ender 3 Direct Extruding Kit with Two in One: 1, Direct extruding mechanism, 2, Complete nozzle kit Integrated Structure with All Metal: It's sturdy and wear-resistant with an all-metal shell and surface oxidation treatment; an Integrated structure is convenient for wiring and replacing. Direct Extruding Smooth Feed-in: Quality Motor: lower torque requirements on the stepper motor, reducing the possibility of the nozzle blockage when retracting filament and malfunction when loading new filament.Even Feed-in: there is more even feed-in with direct extruding than Bowden extruding. Printing at High-Temperature, Strong Compatibility: Compatible with more types of filament when printing under high temperatures, like flexible TPU. It can optimize TPU printing performance. Easy to Install and Use: Switch direct extrusion or Bowden extrusion at any time and easy to disassembly. It doesn't affect the inherent function of the printer because it's a complete extrusion kit.