The invention discloses a novel quick printing spray head. The novel quick printing spray head comprises an extruding tube which is vertically arranged, a screw which is inserted into the extruding tube, a stock holder for storing printing materials, a ring-shaped
spray nozzle, a movable valve, a motor for driving the screw to rotate, a motor for driving the valve to move, and a heating apparatuson the outer wall of the
spray nozzle, wherein the movable valve is mounted inside the
spray nozzle; the movable valve is connected to the motor for driving the valve to move through a rolling ball lead screw, and the motor can be controlled to drive the movable valve to move, so that the opening dimension of the spray
nozzle can be changed. The novel quick printing spray head can change length ofthe spray
nozzle in real time according to dimension changes of a model, increases the printing range of the spray
nozzle, changes conventional dot printing into linear printing, and realizes once printing forming of each layer, so that printing speed is greatly increased;
cooling time, in air, of each layer of the printing materials sprayed out by the spray nozzle is greatly reduced, and layerscan be guaranteed to be connected more tightly, so that strength of a printed part is greatly improved.