3D printed coating 3D printing ABS ASA CuO/ZnO FDM method History of engineering & technology NiAu alloy Raman spectroscopy acrylic polyurethane coating adsorption annealing time attenuation bronze polylactic acid composite carbon/carbon composites chitosan-pectin co-precipitation composites covalent biopolymer framework crystallize process cut fruits doubly-curved shell and panel dye degradation edible coating environmental exposure epoxidized Tung oil four-variable refined shell theory free vibration analysis functionally graded carbon nanotube-reinforced composite (FG-CNTRC) mechanical properties