The present invention relates to a 3D printer, comprising: an output bed including at least one optical marker disposed on a supporting surface for supporting a molding; and an output bed disposed at a position spaced from the central area of the supporting surface, A horizontal adjustment unit installed at a lower portion of the output bed for correcting the horizontal position of the output bed, and a controller for evaluating the horizontal position of the output bed based on the image signal from the image sensor, And a horizontal control unit for controlling the horizontal adjustment unit by determining the degree of horizontal displacement of the picked-up image of the optical marker with respect to a previously stored reference image. As described above, according to the present invention, it is possible to provide a 3D printer including a horizontal adjustment system that increases the accuracy of horizontal correction and shortens the correction operation time to improve the operation efficiency.
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