Abstract: A gantry-based 3D printer contains two vertical columns, connected with each other by a horizontal fixed beam, designed with the possibility of moving along rail guides. The rails are mounted on the printer base. A cross beam is installed on the vertical columns designed with the possibility of moving in the vertical direction; and the carriage with the print head attached to it and the possibility of longitudinal movement is mounted on the cross beam. The rails are equipped with an alignment system, which contains washers, nuts and screws, the latter of which are embedded in the base of the printer. The vertical columns and a cross beam are equipped with V-shaped rails with an additional leveling system, and the vertical columns and a cross beam are moved by roller carriages with the help of a drive and helical rack.