A wiring harness assembly includes a plurality of electrical conductors having wires enclosed within insulative sheaths that are integrally formed of an electrically insulative material. The assembly also includes a lattice support structure that is attached to the insulative sheaths at multiple locations. The lattice support structure is configured to maintain a desired shape of the assembly. The lattice support structure is formed of filaments that may be formed using an additive manufacturing process The filaments may be arranged such that lattice support structure defines a plurality of hexagonally shaped apertures. A process for manufacturing the wiring harness assembly and an apparatus configured to manufacture the wiring harness assembly is also presented.