US Patent 10016930 Printing method of 3D printer

Provided is a printing method of a 3D printer. The printing method uses a 3D printer including a nozzle control module configured to transfer a nozzle to a predetermined location on a plane, and a pair of transfer modules disposed perpendicular to the plane and spaced apart from each other, the method comprising: (a) positioning a first bed between the pair of transfer modules to be in contact with the pair of transfer modules; (b) when the pair of transfer modules moves the first bed downwards, by the nozzle control module, controlling the nozzle to discharge raw materials and thus printing a first printout on the first bed, and also forming a first support on the first bed around the first printout to make a friction with the pair of transfer modules; (c) after the first printout is completely made, forming a second bed above the first printout; and (d) forming a second printout on the second bed, and also forming a second support around the second printout to make a friction with the pair of transfer modules.