rubiks cube core 3d model

Generate a 3D printable hollow core for an electronic Rubik’s Cube. The core must be a single solid object with a large internal cavity for electronics. Shape: spherical or cubic core with smooth surfaces. Include six flat mounting pads aligned with the six faces of a Rubik’s Cube, where sensors or magnets can be attached. The core must have a central cavity accessible from all sides, large enough to fit an ESP32 or Arduino Nano and a small LiPo battery. Do NOT create mechanical parts, gears, or moving elements. The model must be clean, solid, watertight, and easy to print.