spherical power bank 3d model

Create a simple CAD/STL-ready spherical power bank. The outer body must be a complete, perfectly round sphere, about 70mm diameter, with no missing rear surface or distorted shape. At the top, make a circular opening containing ONE SINGLE SMALL SPHERICAL GYRO BALL, about 30–40mm diameter. The gyro ball must look like a real handheld gyro exercise ball: simple, compact and round. IMPORTANT: Do NOT model the gyro as gears, rings, discs, shafts, coils, turbines, or complicated machinery. Think: “ONE LARGE SPHERE containing ONE SMALL GYRO BALL.” Keep the outer body matte black, smooth and minimal. Add a thin LED line around the equator and one centered USB-C port on the front. No handle, loop, hook, stand, or unnecessary parts. Make the outer shell easy to 3D print as two pieces.