Siren Whistle (loud!)
thingiverse
Fast and easy print! Printed with nozzle 0.4 / layer 0.2 - no supports Absolutely minimal construction to turn the <b>large horn</b> available with the <b><a href="https://www.thingiverse.com/thing:5980283">Portable Air Horn<a></b> into a very loud siren whistle. Simple assembly and disassembly. See video below (assembly and sound):
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