gyroscopic sphere 3d model

Create a CAD/STL-ready 3D-printable exterior for a spherical gyroscopic power bank. Rebuild from scratch; do NOT copy the reference. BODY: perfect symmetrical sphere, 70mm diameter × 70mm height. Front, rear, left and right must have identical curvature. NO oval, egg, tilted, flattened, half-sphere, or open-back shape. HOUSING: split horizontally at the equator into TWO printable shells with a thin seam and alignment lip. Opaque matte black PETG/PLA. NO transparent material. GYRO: exact top center with a circular recessed opening, 25–35mm diameter. Inside, place a realistic symmetrical gyro rotor with a central hub and 3–4 concentric rings. It must be centered and upright. NO tilted, distorted, spiky, mushroom-like, or random shapes. DETAILS: thin flush LED groove around the equator. ONE recessed USB-C port centered on the front lower hemisphere. BOTTOM: small flat stability pad, 15–25mm diameter. NO handle, loop, hook, bracket, stand, or extra protrusions.