The MK8 Extruder J-Head 0.4mm Nozzle 1.75mm Filament Fully Assembled Kit is a high-performance 3D printer extruder designed for DIY and professional 3D printing applications. This upgraded MK8 extruder comes fully assembled with extruder drive mechanism, hotend, heating element, thermistor, cooling fan, and a high-power direct drive stepper motor 42BYGHW818. It provides smooth, precise, and reliable filament extrusion while minimizing clogging and jamming.

The kit supports a wide range of filament types including PLA, ABS, PETG, TPU, and Nylon, making it versatile for various printing projects. Its compact and lightweight design, energy-efficient ceramic heating insulation, and direct-drive system ensure excellent performance, stability, and long-term durability. This extruder can also be easily modified for dual-head extrusion setups, ideal for advanced multi-material printing.

Features:

• Fully assembled MK8 extruder kit including drive mechanism, hotend, thermistor, heating element, fan, and stepper motor

• High-power 42BYGHW818 direct drive stepper motor for precise extrusion and flexible filament compatibility (TPU, PLA, ABS, PETG, Nylon)

• 0.4mm nozzle optimized for 1.75mm filament

• Aluminum alloy extruder and radiator with gold color for durability and efficient heat dissipation

• Compact and lightweight design with direct transmission, no heavy gears required

• Ceramic heating insulation cotton for temperature stability and energy efficiency

• High-torque 42mm stepper motor with low heat build-up during operation

• Supports single and dual extrusion modifications for advanced printing projects

• Reliable and less prone to clogging and jamming

• Suitable for DIY 3D printers, Makerbot, Prusa, and professional 3D printing systems

• Easy to install and compatible with standard 3D printer setups

• Maximum temperature support up to 280°C for safe operation

How to Use

• Mount the MK8 extruder assembly onto your 3D printer according to the printer’s hotend mounting instructions

• Connect the stepper motor cables (6Pin PH2.0 to 4Pin SH2.54) and other wiring including thermistor and heating tube

• Ensure proper calibration of the hotend temperature settings, keeping maximum temperature below 280°C

• Feed 1.75mm filament through the extruder mechanism

• Adjust printer settings according to filament type and desired print quality

• Power on the printer and preheat the hotend to the target temperature

• Start printing while monitoring first layers for smooth extrusion and correct flow

• Clean and maintain the extruder regularly to prevent filament buildup and nozzle clogging

Specifications

• Name: Upgrade MK8 Extruder HotEnd for Makerbot / Prusa 3D Printer Parts

• Filament Diameter: 1.75mm

• Nozzle Size: 0.4mm

• Rated Voltage: 12V

• Power: 40W

• Stepper Motor: NEMA17 42HD4027-01, 42×42×40mm, Rated Current 1.5A, Step Angle 1.8°

• Motor Cable: 6Pin PH2.0 to 4Pin SH2.54, Length 100cm

• Feeder Device: Aluminum Alloy Material, Gold Color

• Radiator: Aluminum Alloy Material, Gold Color

• Thermistor: NTC3950 with Dupont Terminal, Length 1 meter

• Heating Tube / Wire: 12V, 40W, Length 1 meter

• Cooling Fan: 40×40×10mm, 12V DC, 0.12A, 2Pin

• Maximum Operating Temperature: 280°C

Applications

• DIY 3D printer projects

• Professional 3D printing systems

• Printing with flexible filaments like TPU

• Multi-material dual extrusion setups

• PLA, ABS, PETG, Nylon printing

• Replacement or upgrade for Makerbot, Prusa, and other MK8-based 3D printers

• Prototyping, hobbyist projects, and small-scale production

• Educational 3D printing demonstrations

mk8 extruder, mk8 j-head, 0.4mm nozzle extruder, 1.75mm filament extruder, 3d printer extruder kit, direct drive extruder, high torque stepper motor extruder, 42BYGHW818 extruder, mk8 hotend, diy 3d printer extruder, prusa mk8 extruder, makerbot mk8 extruder, flexible filament extruder, tpu filament extruder, pla abs petg nylon extruder, dual extrusion extruder, ceramic heating mk8, high performance 3d printer extruder, fully assembled mk8 extruder, mk8 extruder upgrade kit, 3d printer hotend assembly