▎ 摘　　要

NOVELTY - Filament material (110) comprises a polymer resin that is compatible with an extrusion based printing process; and a marking additive that allows selective portions of the filament material to change color when exposed to a light. The marking additive is added to 0.01-25.00 wt.%. USE - The filament material is useful for marking 3D printed object (claimed); and for extrusion-based additive manufacturing systems. ADVANTAGE - The markings may be written to any desired size. In addition, the markings may be added relatively quickly, as the marking additive may change color when exposed to light at speeds up to 8 meters per second. Thus, the markings created by the filament material with the marking additives may be more permanent and secure than currently available marking methods. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) producing a filament material with a marking additive for an extrusion based printer (100), which involves providing a polymer resin that is compatible with the extrusion based printer; mixing into the polymer resin the marking additive in amount of 0.01-25.00 wt.% to form the filament material with the marking additive; and exposing select portions of the filament material to a light to form a mark on a surface of the filament material, where the marking additive mixed into the polymer resin at the select portions absorbs the light to change color and form the mark; and (2) marking a three-dimensional (3D) printed object (114) that is printed with a filament material with the marking additive, which involves receiving, by a processor (102), instructions (106) to print the 3D printed object; controlling, by the processor, an extrusion based printer to print the 3D printed object in accordance with the instructions, where the 3D printed object is printed with the filament material with the marking additive, where the filament material with the marking additive comprises a polymer resin and 0.01-25.00 wt.% of the marking additive; receiving, by the processor, marking instructions (108) associated with a marking for the 3D printed object; and controlling, by the processor, a laser to expose portions a surface of 3D printed object in accordance with the marking instructions to change a color of the portions of the surface of 3D printed object to write the marking on the surface of the 3D printed object. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of FDM printer that uses the filament materials with the marking additives. Printer (100) Processor (102) Marking instructions (108) Filament material (110) 3D printed object (114)