This is Geeetech upgraded single head MK8 extruder which has outstanding quality and the best performance for DIY and professional systems. By simply adding a holder you can assemble your own dual head extrusion. With 42BYGHW818 stepper motor you will find it easy to solve the problems of uneven extrusion regularly plugging and material reloading. Specifications: - Extrusion nozzle: 0.3mm0.35m0.4mm0.5mm (optional) - Material of Print: 1.75mm or 3mm PLA/ABS - Flow rate of Nozzle: about 24cc / h - Sports shaft speed:40mm/s - Voltage of heating nozzle: 12V - Thermistor: 100K NTC - Operating voltage of cooling fan: 12V - Heating rods: 6mm 12V 30W - Normal working temperature: 190°-230° - Net weight: 450g Features: - 42mm high quality stepper motor with larger torque and less heat buildup - Special ceramic insulation cotton ensures the stability of heating; electricity-saving - Direct transmission without the heavy gears compact size and weight - A variety of specifications to choose the most suitable is the best NOTE: Make sure the maximum temperature is less than 280'C