cell nucleus 3d model

Create a simple 3D-printable biological nucleus model: a solid sphere with exactly one quarter removed as a clean 90° cutaway. Inside, add a smaller smooth half-sphere for the nucleolus. Add subtle raised bumps and ridges for chromatin and other nucleus structures. Keep everything clean, solid, geometric, and physically connected—no random blobs, labels, text, stand, or floating parts. Make it look like a physical classroom 3D model, matching the second reference image.