A 3D printer is provided herein. In some embodiments, a 3D printer includes an ink tank for storing ink comprising a magnetic body, an injection nozzle which is linked to the ink tank and is adapted to inject ink, a substrate on which the injected ink is deposited, a heating unit so as to heat the ink coated onto the substrate by means of induction heating, and which is positioned behind the injection nozzle such that injection of ink occurs prior to induction heating of the ink; a carriage unit for changing the positions of the injection nozzle and the heating unit relative to the substrate: and a control unit for controlling the heating unit and the carriage unit.