3D printer nozzle and 3D printer thereof

The invention belongs to the technical field of 3D printers, and particularly relates to a 3D printer nozzle and a 3D printer thereof.The 3D printer nozzle comprises a printer body, a linear guide rail is fixedly connected to one side of the printer body, a cross beam is fixedly connected to the top end of a sliding block of the linear guide rail, and a rotating seat is rotatably mounted at the end, away from the linear guide rail, of the cross beam; a rotating unit is arranged at the top of the rotating seat, a plurality of replacing arms are evenly and slidably installed on the outer ring of the rotating seat, notches are formed in the ends, away from the rotating seat, of the replacing arms, nozzles are slidably installed in the notches, gear rings are fixedly connected to the outer rings of the bottoms of the nozzles, and straight grooves are formed in the middles of the replacing arms. A first motor is fixedly connected to the side, close to a groove opening, of the straight groove, a first gear is fixed