Loud Whistle - Emergency, Sports and Survival Whistle Keychain, No Supports (OpenSCAD)

A loud, pea-less whistle for your keys, backpack, dog walks, camping or the sports field. Blow through the slot: the air jet splits on the sharp edge of the window and rings the round chamber behind it. DETAILS • 50 x 18 x 11 mm with a keyring loop. • Prints on its side with no supports: the air slot, window and chamber are all upright walls, and the top plate makes one short, closed bridge over the chamber. • Bambu Studio: 17 min, 5 g. Print with 3 or more walls so it's airtight. CUSTOMIZE (OpenSCAD) Chamber diameter (smaller = higher pitch), inside width, air slot height and the keyring loop. Designed with AI assistance (OpenSCAD). Rendered images; not printed yet, so the sound is untested: if it only hisses, try a slightly bigger or smaller air slot.