Custom STL Project Human Brain for Crystal Laser Engraving

I need a high-quality STL model of a human brain in true midsagittal section. The model is intended exclusively for internal 3D laser engraving inside an optical crystal block. This is NOT a model for 3D printing. The design should look like a museum anatomical exhibit—scientifically accurate, elegant and artistic rather than highly clinical. Anatomical requirements Create a true midsagittal cut (exactly through the median plane). The following structures should be clearly recognizable: Cerebral cortex Corpus callosum Septum pellucidum Thalamus Hypothalamus Pituitary gland Pineal gland Midbrain Pons Medulla oblongata Cerebellum with visible arbor vitae Fourth ventricle Brain stem continuing into the upper spinal cord These structures must be anatomically correct, but no labels or text should appear anywhere on the brain. Artistic style The style should be: Elegant Minimalist Museum-quality Scientific Refined Premium Avoid: Cartoon appearance Low-poly geometry Stylized gaming models Exaggerated grooves Rough meshes Overly dramatic medical illustrations The folds (gyri and sulci) should be soft, natural and realistic, not exaggerated. Geometry The STL should be: Clean watertight mesh Smooth topology No self-intersections No floating artifacts No unnecessary internal geometry Optimized for crystal laser engraving The brain should occupy approximately 70–75% of the crystal height, leaving empty space around it for an elegant presentation. The text will be written latter Orientation Use the standard anatomical orientation: Left side view Nose facing left Cerebellum posterior Brain stem pointing downward Level of detail Target quality similar to: Gray's Anatomy Netter Atlas High-end medical museum models Not ultra-microscopic. Not simplified. The internal anatomy should remain readable after laser engraving. Deliverables STL High-resolution mesh Ready for laser engraving No supports No base No pedestal IMPORTANT This model will be engraved inside a crystal gift for a neurologist. The goal is to create something that immediately makes another neurologist think: "This is a beautiful anatomical brain." rather than "This is just another generic 3D brain."