The present invention discloses a highly accurate and efficient 3D printer. A rotating housing is installed inside the pedestal, and sliding grooves are installed symmetrically on both right and left ends of the upper end wall of the rotating housing, and the sliding groove is formed between the rotating housing and the mounting base. The mounting base and the base are engaged and connected so as to be slidable through the sliding groove, a mounting hole is installed in the front end wall of the rotating housing, and a first driving machine is installed in the front end wall of the mounting hole. Fixedly connected, a through hole is installed in the front end wall of the mounting hole, the through hole connects the mounting hole and the rotating housing, and the rotary shaft A whose front end passes through the through hole is powered by the first drive unit. A conical pulley A that is connected so as to be able to transmit and is fixedly connected to the front end of the rotation shaft A is installed, and a conical pulley B that engages and connects to the conical pulley A is installed. [Selection] Figure 2
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