hemispherical enclosure 3d model

A handheld hemispherical device shell, outer diameter 100mm, height 50mm, two-part enclosure (top dome + bottom base), wall thickness 2mm, bottom base height 20mm with a flat bottom, four screw holes evenly spaced for M3 screws (3.2mm through holes) on a 90mm bolt circle, a side tube port hole 6.5mm diameter near the bottom edge, a small oval cable slot 10x6mm on the base side, smooth minimal design, no text, watertight manifold 3D printable STL, optimized for FDM printing.