Abstract: An electrical connector assembly includes a connector body that is formed of a dielectric material. The electrical connector assembly defines a terminal cavity configured to receive an electrical terminal. The terminal cavity defines a terminal opening configured to receive a corresponding mating electrical terminal. The electrical connector assembly also includes a collapsible bellows that longitudinally surrounds the terminal opening. The bellows is integrally formed with the connector body. The connector body and the bellows are preferably integrally formed using an additive manufacturing process such as stereolithography, digital light processing, fused deposition modeling, fused filament fabrication, selective laser sintering, selecting heat sintering, multi-jet modeling, multi-jet fusion, electronic beam melting, laminated object manufacturing, or 3D printing.