Large-size high-precision 3D printer

The utility model discloses a large-size high-precision 3D printer which comprises a rack, and supporting rods are symmetrically fixed to the outer side of the rack. The first Z-axis fixing seats are symmetrically arranged on the two sides of the machine frame, a first linear guide rail is fixed to one side of each first Z-axis fixing seat, and a first supporting foot piece is fixed to the movable end of each first linear guide rail. The whole machine is small in vibration in the printing process, an integrated linear module assembly printing assembly design is adopted, through movement of a first linear guide rail, a second linear guide rail, a third linear guide rail and a fourth linear guide rail, the precision of printing assembly is improved, X-axis transmission, Y-axis transmission and Z-axis transmission are stable and high in speed, precise positioning is achieved through a servo motor and an encoder, and the working efficiency is improved. The whole machine is high in machining precision, rigidity an