1. A method for manufacturing a 3D printing structure, the method comprising: producing a molded body by performing 3D printing on paste including printing powder in a coagulation bath including a hydrogel; hardening the molded body produced in the coagulation bath; and removing the hydrogel in the coagulation bath; and completely hardening the molded body after the removing of the hydrogel in the coagulation bath, wherein the completely hardening of the molded body is performed at a temperature of 20° C. to 60° C.
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