A marking device for marking a truss element of a truss may include a print mechanism arranged to print selected truss information on lumber elements moving on a conveyance system passed the print mechanism, the selected truss information including one of an element identifying truss diagram, a truss plate location, and an intersecting member identifier, a position sensing device configured to sense the position of the lumber relative to the print mechanism, and a computing component, the computing component including a geometry extraction module for extracting the geometry of the element to be marked, an element marking generator for generating print instructions for the selected truss information, a position sensing module for interfacing with the position sensing device to ascertain the position of the lumber element, and a print control module for controlling the print mechanism to print the selected truss information.