Multi-shaft annular feeding 3D printer head

The invention relates to the technical field of 3D printers, and particularly discloses a multi-shaft annular feeding 3D printer head which comprises a machine head base, a heating block, a nozzle and a heat dissipation piece, a multi-shaft belt type feeding assembly and a consumable feeding guide piece are symmetrically arranged on the machine head base, and the multi-shaft belt type feeding assembly comprises a rotating shaft rotationally connected to the machine head base; the number of the rotating shafts is not less than two, the rotating shafts are arranged in rows in the conveying direction of the consumables, synchronous belts for feeding the consumables are arranged on the rotating shafts in rows, and a feeding motor for driving the rotating shafts is further arranged on the machine head base. A wheel type feeding structure is changed into a multi-shaft belt type feeding structure, original point contact between a feeding wheel and consumables is changed into surface contact, the stress area of the c