Vỏ AirTag Chống Nước (Lắp Ráp)

This two-piece AirTag case assembly is designed for strength, precision, and everyday durability, secured using four M3×6 mm socket head bolts with threads formed directly into the printed plastic—no nuts or inserts required. Integrated mating alignment features ensure accurate assembly and a consistent seal, enhancing the case’s water-resistant performance when properly tightened. For best results, print both parts at 20–30% infill for an ideal balance of strength and weight, and take care not to over-torque the fasteners to prevent stripping. This design is optimized for clean printing, easy assembly, and reliable protection of your AirTag in demanding environments.

You could put a ring of silicone, very thin, around the raised circular mating feature to improve the water resistance... I think in general, this will keep water out unless fully submerged.