Air nozzle device for 3D printer

The utility model discloses a tuyere device for a 3D printer, which relates to the technical field of 3D printers and comprises a machine body, water tanks are symmetrically mounted at the lower end of the machine body, air inlets are formed in the rear ends of the water tanks, a wire feeding throat pipe is mounted at the lower end of each water tank, and a nozzle is mounted at the lower end of each wire feeding throat pipe. An air spraying nozzle is arranged around the outer part of the spraying head; the device has the beneficial effects that through the arrangement of the annular air duct at the lower end of the air spraying nozzle, hot air can be sprayed out in a 360-degree annular mode, it is guaranteed that consumables extruded out of the spraying nozzle have no heating dead angles, the heating area of air sprayed out of the annular air duct is large, and full annealing of a printing model of a crystallizable material is facilitated; hot air can be accurately blown to the position, where consumables are