## Design Concepts This whistle features a sleek, minimalistic design, emphasizing function with a simple structure suitable for swift 3D printing. ## Uses It's perfect for coaching, refereeing sports, or personal safety in outdoor activities. Its compact design ensures easy portability. ## Printing Tips Use PLA material with a layer height of 0.2mm for a balance between print speed and surface finish. No supports are necessary due to its geometries, and ensure sufficient infill percentage for durability. ## Assembly Instructions The product is one solid print with no assembly needed. Ensure the ball inside moves freely and the exterior is smooth post-print for optimal sound quality.