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For folks who’re interested in 3d printing whistles: https://www.printables.com/model/417238-loudest-emergency-whistle is the best I’ve found.

They’ve been tested on canyoneering trips — we use whistles to communicate over the sound of waterfalls; nothing else is piercing enough to cut through the thunder. These work as well as the gold standard Fox 40 Classic.

I print it florescent orange PLA, with an 0.6mm nozzle and 0.3mm layer height, and make lanyards out of orange paracord.