3D printer and 3D printing method using same

The invention discloses a 3D printer. The 3D printer comprises a material supplier; a print head; printing a substrate; the printing head is mounted at a discharge port of the material supplier; the printing substrate is located below the printing head, is detachably arranged on a base of the 3D printer through a first mechanical part and a second mechanical part, and moves and rotates through a first motor for driving the first mechanical part and a second motor for driving the second mechanical part; the printing substrate is provided with a curved surface structure; the first mechanical part and the second mechanical part are arranged on different sides of the printing substrate; and during printing, the first mechanical part and the second mechanical part do not act on the printing substrate at the same time. According to the 3D printer and the 3D printing method using the 3D printer, 3D printing of a curved-surface product from inside to outside can be achieved without designing a complex supporting body