Safety Whistle Public Domain - Small - 114.6 db - Penne Style

I created this compact, powerful safety whistle from scratch to be freely shared with anyone who needs one, no questions asked.

Whether you’re boating, hiking, camping, running, training scouts, or standing up for your safety and your voice, this whistle is meant to be there when you need it most.

This design is Public Domain (CC0). You can print it, share it, remix it, or distribute it freely.
The goal is simple: get a whistle into the hands of anyone who might need one — anywhere, for any reason.

If you’re part of a community, organization, or cause that distributes safety tools, feel free to print and share these in bulk. They’ve already reached thousands of people and continue to spread thanks to makers like you.

All .stl files are listed below. If you want a version to maximize your print bed size, message me your dimensions and I can make that happen.

If you don’t have a 3D printer, we can still get you a safety whistle — no questions asked.
If you are in the Chicagoland area, we can arrange an anonymous drop.
We’ve also partnered with Slant3D to print and ship whistles worldwide (paid option).

Print settings:

0.4mm nozzle
Layer Height: 0.24 mm
Walls: 2–3 Arachne
Infill: 100% (for maximum tone and durability)
Supports: None
Material: PLA+ or PETG

Tips/ Reccomendations

With any print with many small parts I must emphasize the importance of making sure the printer is tuned more than normal and I reccomend super tack build plates or that you take well know best practices for optimal first layer adhesion, we are putting lots of these on one plate sometimes the basic PEI Plates are not generally sufficient alone for this type of adhesion depends on the model. Please be mindful of this while printing or if you are considering printing these en masse. These have been tested in the tens of thousands at this point, please take proper precautions we recommend to start with a smaller number and work your way up as you get more comfortable with a higher number. The Bambu Supertack cool plate has basically erased any adhesions issues on the bambu machines, on the Elegoo CC the side B 5 star plate has also resolved any issues. If you attempt a larger number on a standard PEI plate and get failures please consider switching the build plate to something known for solid adhesion or using adhesions aides.

Turning quiet into the safety of sound.