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Upgrading Extruder kits for ANYCUBIC i3 Mega 3D Printer Extruder Frame Specifications: Material: Injection molding plastic Driving Gear Diameter: 12mm ; Driven Gear Diameter: 8mm ; Transmission Ratio: 3:1 ; Stepper Motor Specifications: Motor Type: Bipolar Stepper Number of Phase: 2 Step Angle: 1.8 deg. Rate Voltage: DC 3.0V Holding Torque:DC 1.2A Phase Resistance: 2.5ohms±10%(20℃) Phase Inductance: 3.8mH±20%(1KHz) Rotor Inertia:30.8g.cm2 Item Size: Appr. 63*85*69mm Item Weight: Appr. 290g Package List: 1 x Upgrading Extruder kits 1 x Nema 17 Stepper Motor 3 x Wrenches 1 x Instruction Manual