Safety Whistle
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A very loud safety whistle.
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Updated at source:
Model information
- Source
- Printables
- Category
- Outdoor Sports
- License
- Open Community License v1
An incredibly compact, loud (100db+) safety whistle to alert others nearby of present or active danger.
Print Details
Material: 1.26g / 0.43m
Time: 3m
Size: 36mm x 11mm x 4mm
Print Settings and Tips
My settings and setup are as follows:
Nozzle Size: 0.4mm
Layer Height: 0.28mm
Perimeters: 2
Infill: 0%
Supports: No
Consider rotating your bridges so they go the short way across the whistle.
Source and Other Platforms
Available on OnShape
Available on MakerWorld
Available on Thingiverse
Acknowledgements
While I iterated on the internal chambers and overall size, I did so only after studying the Flat Pocket Whistle by Jonas Daehnert and the Micro Bitonal Whistle by AC Studio.
If you like my work, consider supporting folks doing great work to protect our neighbors.
Updates
[ 1/29/2026 ] Height modifications and tests.
After printing several hundred of these, I decided to reduce the height by 1mm to save a little (0.08g) filament per print. The volume of the whistle is maintained, and it is not too much harder to blow into. I had originally tried a 3mm height, and while it was successful, it required a lot more effort to blow into than I liked.
I also enjoyed the robustness of the thicker loop, so that is the default approach now.