The invention provides a novel 3D printer head. The novel 3D printer head comprises a base, a feeding mechanism, an extrusion head, a hot-melting component and a gas purification device. A connectingbody is arranged at the lower end of the base. The hot-melting component is arranged in the connecting body. Consumables conveyed by the feeding mechanism located in the base are molten through the hot-melting component and then extruded downwards by the extrusion head at the lower end of the connecting body. The gas purification device is arranged on the outer circumference of the connecting body. A floating balance mechanism is further arranged in the base and comprises a floating wire piece, a spring and a floating cover plate. The floating wire piece extends into the connecting body from the lower side of the feeding mechanism. The floating cover plate is connected to the lower end of the floating wire piece. The periphery of a feed throat pipe of the floating wire piece is sleeved with the spring. According to the novel 3D printer head, hazardous gases generated in the melting process of the consumables can be absorbed and eliminated, and thus, the environmental friendliness is improved.