An additive manufacturing process comprising: providing a first printing composition comprising a plurality of metal nanoparticles and a second printing composition comprising a dielectric material, wherein the plurality of metal nanoparticles is selected from a group consisting of tin nanoparticles, copper nanoparticles, aluminum nanoparticles, palladium nanoparticles, silver nanoparticles, iron nanoparticles, cobalt nanoparticles, nickel nanoparticles, titanium nanoparticles, zirconium nanoparticles, hafnium nanoparticles, and tantalum nanoparticles and the dielectric material comprises at least one of polyketones, polystrenes, acrylonitrile-butadiene-styrene copolymer, polyetheretherketones, polyamides, polyolefins, polyethylene, polypropylene, polyesters, polyurethanes, polyacrylonitriles, polycarbonates, polyetherimines, polyethyleneimine, polyethylene terephthalate, polyvinyl chloride, polyetherimine, polycarbonate, and polyetherimine; depositing at least a portion of the second printing composition above a softening temperature of the dielectric material to form an object having a desired shape; cooling the first portion of the object below the softening temperature and above a fusion temperature of the metal nanoparticles before depositing the first printing composition; depositing the first printing composition on the first portion of the object, the metal nanoparticles being unconsolidated with one another while being deposited; and maintaining the deposited first printing composition above a fusion temperature of the metal nanoparticles and below a softening temperature of the dielectric material during depositing the first printing composition to define one or more contiguous metal traces in the object, the one or more contiguous metal traces comprising metal nanoparticles that have been at least partially fused together with one another in a defined shape. providing a first printing composition comprising a plurality of metal nanoparticles and a second printing composition comprising a dielectric material, wherein the plurality of metal nanoparticles is selected from a group consisting of tin nanoparticles, copper nanoparticles, aluminum nanoparticles, palladium nanoparticles, silver nanoparticles, iron nanoparticles, cobalt nanoparticles, nickel nanoparticles, titanium nanoparticles, zirconium nanoparticles, hafnium nanoparticles, and tantalum nanoparticles and the dielectric material comprises at least one of polyketones, polystrenes, acrylonitrile-butadiene-styrene copolymer, polyetheretherketones, polyamides, polyolefins, polyethylene, polypropylene, polyesters, polyurethanes, polyacrylonitriles, polycarbonates, polyetherimines, polyethyleneimine, polyethylene terephthalate, polyvinyl chloride, polyetherimine, polycarbonate, and polyetherimine; depositing at least a portion of the second printing composition above a softening temperature of the dielectric material to form an object having a desired shape; cooling the first portion of the object below the softening temperature and above a fusion temperature of the metal nanoparticles before depositing the first printing composition; depositing the first printing composition on the first portion of the object, the metal nanoparticles being unconsolidated with one another while being deposited; and maintaining the deposited first printing composition above a fusion temperature of the metal nanoparticles and below a softening temperature of the dielectric material during depositing the first printing composition to define one or more contiguous metal traces in the object, the one or more contiguous metal traces comprising metal nanoparticles that have been at least partially fused together with one another in a defined shape.