THREE-DIMENSIONAL SHAPE FORMATION

PURPOSE:To form a desired three-dimensional shape with a good accuracy without deviating respective positions between respective cured resin layers by forming preliminarily continuous dummy cured resin layers on the lower side of a branching section when the three-dimensional shape is provided with the branching section is not extended down to the lowest end. CONSTITUTION:A three-dimensional shape 39 is formed based on a three- dimensional image 43 formed by adding a dummy section 42 at the lower section of a handle 41. Liquid photosetting type resin 4 in the thickness of first floor pitch is positioned on the upper surface of a stage 6, and scanning is carried out by exposed beam 18 to form cured type resin 451 and a cured resin layer 461. An elevator 5 is moved downward by the distance of first floor layer pitch, and the liquid photosetting type resin material 4 flows in by the thickness of first floor layer pitch, while scanning of exposed beam 18 is carried out to form cured type resins 452 and 462. Said operation is repeatedly carried out to laminate successively cured resin layers 45 of a cup main body 40 and cured resin layers 46 for a dummy section 45. Thus, a three-dimensional image is formed based on the three-dimensional image 43, and then the dummy section 42 is removed.