Three-dimensional shaping method

A three-dimensional shaping method for forming a three-dimensional product, comprising the steps of:

• (1)-1 forming forming a powder layer with a predetermined thickness,
• (1)-2 on each said layer to be sintered, in which instructions that raised sintered portions are formed after sintering from a sintered region, with positions in a horizontal direction and a height direction having one of a cross-sectional circular area and a diameter of the circular area before sintering the region, is based according to the following comparison standard:
• whether the one of the cross-sectional circular area and the diameter is greater than a predetermined value,
• (2)-1 in the case that the one of the cross-sectional circular area and the diameter of the circular area is greater than the predetermined value such that the raised sintered portions are not formed, causing the region to be sintered,
• (2)-2 (i) in the case that the one of the cross-sectional circular area and the diameter of the circular area is not greater than the predetermined value such that the raised sintered portions are formed, temporarily stocking positions in the horizontal direction and the height direction at a region of the one of the cross-sectional circular area and the diameter of the circular area,
• (ii) causing the respective powder layer to be sintered after said temporarily stocking,
• (iii) causing a rotating cutting tool to cut the stocked positions, so that the rotating cutting tool cuts any raised sintered portions,
• (3) causing a cutting tool to cut a periphery thereof while traveling along an outside edge of the periphery to form the layer of an article, the step of cutting a periphery occurring according to one of the following:
• if the step (2)-2 (iii) occurs, after the step (2)-2 (iii), or
• if the step (2)-2 (iii) does not occur, after the sintering in step (2)-1 and
• (4) repeating steps (1)-(3) for each layer in an additive manufacturing process.