Extruder Kit Left Side Upgraded Red MK8 All Metal Bowden for 1.75mm Filament Enhanced 3D Printer Extruder Replacement Kit - Suitable for Ender-3 PRO,Tornado,CR-10,CR-10S. Easy to install, unscrew the old original plastic extruder and screw in the new metal extruder and ready to print. Dual-gear extrusion mechanism, high extrusion force for uniform feed. Made of aluminum alloy, full metal, high quality and durable, able to enhance the performance of the original printer. Advantages of Metal Extruder: The metal extruder has better pressure and can be pushed into the printer nozzle to improve the performance of the printer. Our extruder kit has an adjustable screw that allows you to adjust the pressure of the extruder gearbox as needed. All-metal aluminum alloy, kit and must be assembled. The metal material extruder set is more stable and durable during operation than the original plastic extruder set. DIY kit and you need to assemble by yourself. A stepper motor is characterized by converting a series of input pulses into precisely defined increments of the shaft position. This is a high quality motor that can be used for long periods of time without getting stuck.