Multi-printing-head integrated truss 3D printer with variable radius and using method thereof

The invention relates to a multi-printing-head integrated truss 3D printer with a variable radius and a using method thereof. The multi-printing-head integrated truss 3D printer comprises a rack, three groups of edge forming module, a surrounding forming module and an angle adjusting module, the surrounding forming module and the angle adjusting module are connected to the rack, the surrounding forming module, the angle adjusting module and the edge forming module are connected, the surrounding forming module is composed of a first clockwise-cycle surrounding sub-module, a second clockwise-cycle surrounding sub-module and a reverse-cycle surrounding sub-module from bottom to top, the angle adjusting module is composed of three groups of upper adjusting modules and three groups of lower adjusting modules which are installed on the rack and are distributed along the central axis of the rack at equal intervals in an array mode, the lower adjusting modules and the corresponding upper adjusting ...