The present invention relates to a 3D printer outputting method for mounting electrical components, the method comprising a step of generating a structure forming unit structures and a step of positioning component objects on the structure. The positions of the component objects can be changed by using a coordinate system. In mounting a component object (20) on a structure (10), a coordinate system (140) is used to check for colliding or overlapping portions of the component object and to determine whether the component object (20) is supported by unit structures (15), and the merits of 3D are used to rearrange the colliding or overlapping portions or portions, that are not supported, into other dimensions. In addition, in order to automatically insert an actual component object (20), the component object is picked up by a well-known pickup device (30), and the time point and position at which a second component object (20′) is to be inserted in the first component object (20) are predetermined.