[en] Recently, various products using 3D printers have received great attention, and research on related technologies is being actively carried out. Among these studies, research on process and equipment is active, but the research on materials is relatively scarce currently. To overcome this, we analyze the spectral characteristics according to the shape of the material, and analyze them to apply the data for sintering using light energy. As a result, the absorption rate of a specific wavelength increases or decreases depending on the shape of the nanoparticles, and a phenomenon is noted wherein the absorption rate increases, or the absorption wavelength shifts around a specific wavelength. This can be used for the selection of the wavelength of the light energy and the selection of the material according to the shape of the pattern desired to be manufactured