compact cube connector 3d model

A compact cubic mechanical connector block, size 30mm x 30mm x 30mm. The object is made of matte black plastic with smooth rounded edges. The cube has three perpendicular cylindrical sockets (on three adjacent faces), each containing a precisely embedded hex metal nut. The nuts are standard M7 threaded metal nuts, clearly visible and tightly seated inside the plastic housing. The interior structure includes supporting ribs connecting the central core to each nut housing for strength. The design should look like an industrial modular joint connector, with clean engineering details and realistic materials (plastic + metal contrast). Wall thickness optimized for 3D printing with approximately 50% infill structure implied. High detail, realistic lighting, sharp edges, functional mechanical design, product-style rendering.