Stable Monitoring Buoy

Design a simple, robust, 3D-printable floating buoy for an autonomous environmental monitoring system. PRIORITY #1: IT MUST FLOAT STABLY IN WATER WITH THE ELECTRONICS AND SENSORS INSTALLED. Create a wide, stable, sealed hollow body with a large central internal cavity for electronics. The electronics cavity should have as much usable volume as possible while maintaining strong walls and reliable buoyancy. The design should have: * Wide, low center of gravity geometry for stability * Large sealed internal air volume for buoyancy * Thick, strong FDM-printable walls * Removable waterproof top lid * Enough reserve buoyancy to support the electronics, battery and sensors * A bottom section that can accommodate ballast to keep the center of gravity low * Strong attachment points for external sensors and a tether * Smooth rounded exterior suitable for floating in real water * No solar panel * No complicated internal electronics mounts * No predefined sensor holes or sensor arrangement; these will be drilled/modified later Target approximately 300 mm diameter × 200 mm height, but prioritize buoyancy and stability over exact dimensions. Make it a practical engineering buoy, not a decorative model. Design the geometry so its buoyancy and stability can be calculated from the CAD volume and component mass.

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