4-slot battery holder 3d model

Create a precise, clean, manufacturable 3D model based on the reference image. Object: cylindrical battery holder for 4 AA batteries. Style: functional industrial design, minimalistic, durable, slightly tactical. Geometry requirements: - Rectangular body with rounded edges and corners - Four vertical cylindrical slots aligned side by side - Open side walls with vertical structural supports (evenly spaced) - Top section with four semicircular cutouts aligned with the battery slots - Bottom closed base with proper thickness - Uniform wall thickness suitable for 3D printing (minimum 2.5mm) - Smooth fillets on all edges (no sharp corners) - Symmetrical design across the center axis Dimensions: - Real-world scale for AA batteries (diameter ~14.5mm, length ~50.5mm) - Add small tolerance (0.5mm clearance) for easy insertion/removal Model requirements: - Watertight mesh (manifold) - No internal artifacts or floating geometry - Optimized for FDM 3D printing (no unnecessary overhangs > 45°) - Clean topology, low t