This upgraded air duct primarily addresses issues such as extruder and nozzle jamming, and poor print quality. It comes with built-in cooling ducts for the extruder gears and nozzle filaments. This perfect cooling duct features a double-layer spiral air duct from the extruder to the nozzle and nozzle tip. Functions: 1. The extruder gear cooling duct solves issues like overheating, crushing filaments, and jamming. This is the ultimate cooling system. 2. For the nozzle heat sink, with the large holes facing outward to avoid wiring. This shields against heat radiation from the ceramic heater and extruder. By drawing relatively cool air directly from the outside of the print head, combined with extruder cooling and the enhanced nozzle heat sink, you've created a print head capable of precisely controlling extrusion even at high temperatures. This directly improves print quality. 3. The nozzle cooling duct features a double-layer spiral cooling system. The inner layer is specifically responsible for rapid and concentrated cooling of freshly extruded filament, while the outer layer cools the surrounding areas, either about to be or already formed. This division of labor is clear. After extensive optimization, both air duct systems deliver maximum airflow, demonstrating a carefully considered design. Color: Black Material: plastic Package Contents: 1* Air Duct