Large 3D printer based on FDM principle

The utility model relates to the technical field of 3D printers, in particular to a large 3D printer based on the FDM principle, which comprises a fixed frame, a printing structure is arranged on the fixed frame, the printing structure comprises a plurality of first lead screws movably mounted in the fixed frame, and a first brake motor is mounted at one end of each first lead screw. Through the arrangement of the printing structure, the third lead screw, the first lead screw and the second lead screw are adopted on the x axis, the y axis and the z axis in the fixed frame for transmission, the first lead screw, the second lead screw and the third lead screw are all ball screws, and the transmission precision is higher than that of belt transmission of a traditional printer; and the nozzle body in the printing structure is an integrated nozzle, so that the printing speed of the printer is effectively improved, and the printing quality and efficiency are further improved. 本实用新型涉及3D打印机技术领域，具体为一种基于FDM原理的大型3D打印机，包