To provide a 3D printer and a division printing method for division printing, capable of avoiding warp and deformation of an object.SOLUTION: The division printing method for a 3D printer contains: a step of gaining a slice data of one print layer on printing; a step of executing a logical division operation of slice data in accordance with a predetermined division template to form a plurality of print areas; a step of marking each print area in accordance with a predetermined print rule to decide a print order of the plurality of print areas; a step of controlling the 3D printer to execute printing divided in accordance with each print area based on a decided print order; and a step of executing said steps repeatedly until printing of all print layers of the 3D model is completed.SELECTED DRAWING: Figure 3
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