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[ What is claimed is:] [1.] An apparatus for forming a three-dimensional object on a substantially cross-section by cross-section basis from a building material which is normally in a solid state and which is flowable when maintained at or above a flowable temperature, comprising:at least one comput

[ What is claimed is:] [1.] An apparatus for forming a three-dimensional object on a substantially cross-section by cross-section basis from a building material which is normally in a solid state and which is flowable when maintained at or above a flowable temperature, comprising:at least one computer programmed to convert data descriptive of a faceted representation of the object into data descriptive of object cross-sections;means for maintaining the building material at or above the flowable temperature thereby forming flowable building material;a dispenser responsive to the at least one computer for selectively dispensing successive layers of the flowable building material according to the data descriptive of object cross-sections; anda building environment which is maintained below the flowable temperature and into which the flowable building material is dispensed.