this alarm whistle is designed to generate an intense sound. you can use it into a pendant or keychain.
optimized for a 0.4mm filament. PARAMÈTRES D'IMPRESSION 3D support free printed in 23 minutes with a Prusa i3. sound demonstration here https://www.youtube.com/watch?v=rxTrr7LR6y4&feature=youtu.be
more https://www.3d-fabric-jean-pierre.com