Loud Chicago Flag Keychain Emergency Whistle
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Loud Chicago flag emergency whistle with "No Kings" emblem or Chicago Whistle Protocol instructions on the opposite side
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Model information
- Source
- Printables
- Category
- Audio
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Chicagoans have recently found ourselves in need of emergency whistles, so I designed one specifically for this moment. While this is an original creation, the resonance chamber is certainly inspired by the Loudest Emergency Whistle by @ThreeDMichael.
The whistle itself is quite loud, very sturdy, and the 3/16" (4.8mm) eyelet will fit a standard split keyring 1" (25mm) or larger.
Fusion 360 design files are included.
Update for 8 November 2025:
I added a version that swaps the "No Kings" logo for instructions on the Chicago Whistle Protocol along with the ICIRR Hotline. The updated 3MF switches the flag and text to modifiers, which makes it easy to remove some or all of them if you want to remix the design.
Print Settings
Print with a 0.4mm nozzle at 0.2mm layer heights, 5 top & bottom layers, 3 perimeters, and thick bridges. Pretty much any material should be fine (I had no problem with PLA and ASA).
The version with instructions includes small text that must be printed at 0.24mm extrusion width for the perimeters.
The versions with text use six filament changes, and the plain version is only four. So, you don't need a multi-material printer if you're willing to do the manual filament changes.