Key benefits Reliable plugandplay replacement: Preassembled and factory concentricitycalibrated hotend reduces installation errors that cause clogs and uneven extrusion. Swap the old unit and resume printing quickly. Stable temperature and improved print quality: Aluminium heating block with a 40W rated heater and preinstalled dualpin NTC thermistor delivers fast, accurate temperature control for consistent extrusion during long prints. Reduced thermal creep and better flow: E3Dspec nozzle design plus a CR10style heating block minimize thermal issues that affect layer quality and dimensional accuracy. Ready for maintenance and upgrades: Includes essential parts so you can service or upgrade your hotend without hunting for compatible accessories. Compatibility and key specifications Designed for 12V 3D printer mainboards only. Rated heater power: 40W. Models referenced: Ender 3, Ender 3 Pro, Ender 3 V2, Ender 3 Neo — confirm your printer is the 12V version. This kit is not compatible with 24V systems; connecting to 24V will render the device inoperable. Nozzle size: 0.4 mm (brass, standard). Heating block: performance aluminium. Nozzle standard: E3Dspec. Thermistor: preinstalled dualpin NTC for precise temperature feedback. Cable length: 1 metre. What's included Core hotend assembly (integrated CR10 heating block with E3Dspec nozzle), preassembled and calibrated. Universal 0.4 mm brass nozzle (installed). Heatresistant silicone sleeve to reduce heat loss and prevent filament sticking. 1metre cable for flexible installation. How this kit solves common printing problems Prevents installation misalignment: Factory concentricity calibration eliminates a common cause of clogs and inconsistent extrusion after replacement. Improves thermal response: The 40W heater and aluminium block reach and maintain set temperatures faster and with less fluctuation during long prints. Reduces filament backflow and thermal creep: The E3Dspec nozzle and heating block geometry help maintain a stable melt zone, improving surface finish and dimensional accuracy. Simplifies maintenance: Bundled nozzle and sleeve make routine servicing faster and reduce downtime. Installation notes and safety Verify your printer's power supply is 12V before installing. This kit will not work with 24V systems. The unit is preassembled; installation is typically a direct swap of the old hotend. Follow your printer manufacturer's safe power‑off and wiring procedures. Use the included 1metre cable and check connector orientation to ensure proper wiring. Practical applications and scenarios a failed or clogged hotend on a 12V Ender 3/3 Pro/3 V2/3 Neo to get the printer back online quickly without calibration headaches. Upgrade a stock hotend for more stable longduration prints where consistent temperature and extrusion reduce the chance of print failures. Perform routine maintenance or part refreshes: the kit's nozzle, silicone sleeve, and calibrated assembly let you service the hotend with minimal adjustment. Materials and performance summary Aluminium heating block for fast heatup and stable temperature control. E3Dspec brass nozzle (0.4 mm) to limit thermal creep and maintain consistent flow. Dualpin NTC thermistor preinstalled for accurate temperature monitoring. 1metre cable for flexible, tidy installation. Important reminder Confirm your printer is the 12V version before . Incorrect voltage will make the device inoperable.