Abstract: The present invention provides an ink composition for 3D printing based on a urea reaction that is applied as a liquid on a build platform, undergoes a phase change to a gelled solid in an applied state, and forms a 3D structure by being cured by cross-linking through the urea reaction with a curing agent ink sprayed onto a surface, and a 3D printing method using the same.

Abstract: The present invention provides an inkjet-type 3D printing method using a urea reaction capable of quickly printing a large-area 3D structure regardless of a size of a printed matter by printing a 3D structure on a surface of a subject ink applied in units of layers through the urea reaction between a hardener ink and the subject ink applied by an inkjet method while omitting a separate supporter structure for supporting an overhang portion of the 3D structure to be printed during 3D printing by using, as the subject ink, a phase change ink composition ink that exists in a liquid phase at room temperature but is frozen and gelled at a certain temperature or lower.

Abstract: The present invention relates to a continuous production-type 3D printing method comprising: installing a build platform on a metal conveyor belt so as to be inclined at a predetermined angle to the upper surface of the belt; and repeatedly performing a printing process of applying a photocurable ink composition layer by layer on the top surface of the build platform, and selectively curing the applied photocurable ink composition by irradiating thereto a light pattern through a light irradiation means, wherein by driving the conveyor belt, printed material blocks stacked on the conveyor belt are transferred in one direction in accordance with the speed of the printing process such that print spaces for subsequent layers can be continuously secured through the transfer of the printed material blocks.