Compatibility: Designed as a spare parts kit for Neptune 3 series 3D printers, including Neptune 3 Pro, Neptune 3 Plus (3Plus), and Neptune 3 Max models. Included components: 0.4 mm brass nozzle, hot end heating block, cartridge heater, and thermistor kit. All parts are provided to support a complete hotend replacement at 24V 40W. Thermal performance: Optimized heat dissipation and insulation to maintain stable nozzle temperatures and reduce print interruptions caused by heat fluctuations. Key benefits: Enables easy replacement of worn or faulty hotend components, delivers reliable heating, and supports consistent printing with a standard 0.4 mm nozzle for good balance of detail and speed. Applications and use scenarios: Replacement during routine maintenance to restore print quality and reliability on Neptune 3 Pro, 3 Plus, or Max printers. Upgrading older Neptune units to improve temperature stability for longer prints or when switching to slightly different filaments. Keeping a ready spare parts kit on hand in a busy workshop to minimize downtime during print runs. Specifications at a glance: Nozzle size: 0.4 mm brass Components: hot end heating block, cartridge heater, thermistor kit Voltage and power: 24V, 40W Intended use: Neptune 3 Pro, Neptune 3 Plus, Neptune 3 Max printers Design and fit: Built to align with Neptune 3 series hotend geometry, supporting straightforward installation and dependable operation without modifying the printer.