FDM bottom plate mounting structure of 3D printing device

The utility model relates to the technical field of 3D (three-dimensional) printers, in particular to an FDM (fused deposition modeling) bottom plate mounting structure of a 3D printing device, which comprises a box body, expansion pieces are mounted at four corners of the bottom of the inner side of the box body, a plurality of positioning rods are equidistantly arranged between every two adjacent expansion pieces between the bottom and the top of the inner side of the box body, and the inner side of the box body is provided with an opening. A mounting plate is mounted at the top of the expansion piece, threaded holes are formed in the four corners of the top of the mounting plate, a plurality of through holes are formed in the positions, between every two adjacent threaded holes, of the top of the mounting plate at equal intervals, and damping sleeves are mounted at the positions, close to the four inner corners of the mounting plate, of the top of the mounting plate; compared with an existing 3D printer bo