3D printing nozzle

The utility model discloses a 3D printing spray head. Including a nozzle, a discharge hole is formed in the nozzle; a first cavity capable of enabling the needle valve to do reciprocating motion is further formed in the nozzle; a needle valve is connected into the first cavity in a matched mode. Wherein a first cavity is formed in the needle valve, a second cavity is formed in the needle valve, athrough groove is further formed in the needle valve, one end of the through groove is communicated with the second cavity, the other end of the through groove is communicated with the first cavity, and by means of the structural design, the phenomena of wiredrawing and permeation of the 3D printing spray head are effectively avoided. 本实用新型公开了一种3D打印喷头，包括喷嘴，所述喷嘴上设置有出料口，所述喷嘴内还设置有能让针阀做往复运动的第一腔体，所述第一腔体内配合连接有针阀，所述针阀内设置有第二腔体，所述针阀上还设置有通槽，所述通槽的一端与第二腔体相通，所述通槽的另一端与第一腔体相通，本实用新型通过上述结构的设计，有效的解决了3D打印喷头出现拉丝和渗透现象。