A method of fabricating a three-dimensional single, multiple, and gradient metallic object includes mixing a photocurable resin with or dissolving anhydrous metal salt powder to form a metal salt resin, receiving a digital model of the metallic object, receiving a mask image video of the digital model, the mask image video comprised of a collection of two-dimensional mask images that each represent a cross-sectional area of the metallic object, projecting the mask image video and a light beam into a tank containing the metal salt resin, and printing the metallic object with the metal salt resin from the tank as a build platform positioned above the tank moves upward, wherein each cross-sectional area of the metallic object is selectively cured with the light.

A manufacturing method of a fiber includes: mixing and stirring a plurality of raw materials, to form a mixed liquid, where the plurality of raw materials includes dry copper nanopowder with a particle size not more than 48 nm, a fiber slurry, and an additive; drying the mixed liquid, to remove moisture of the mixed liquid and form a processed raw material; heating the processed raw material, to make the processed raw material be in a semi-molten state; electrifying the processed raw material in the semi-molten state, and then extruding at least one fibril from the processed raw material in the semi-molten state; stretching the at least one fibril; and performing cooling and shaping on at least one stretched fibril, to form a final fiber product.

Provided is a stereolithographic resin composition that suppresses sedimentation of the filler during shaping, has good handleability, and has high thermal conductance of the cured product. A stereolithographic resin composition containing a photocurable resin and a filler, wherein the filler is a metal-coated particle having a base particle including a polymer material and having a metal layer coating the surface of the base particle, and a density of the metal-coated particle is 1.5 g/cm.sup.3 to 4.0 g/cm.sup.3.