Captive-Pea Emergency Keychain Whistle
Created 1 months ago
Description
A 50mm print-in-place emergency whistle built around a 12mm spherical resonating chamber. It features a tapered mouthpiece and an integrated 7mm captive pea that creates a high-decibel warble, all packed into a low-profile keychain block.
Remix Hooks & Constraints
- Chamber Geometry: The fundamental tone is dictated by the 12mm sphere. Expanding this chamber lowers the pitch, while shrinking it creates a sharper, higher shriek.
- Captive Pea: The 7mm pea prints with a 0.2mm floor gap. This clearance is just tight enough to prevent the sphere from tearing off the build plate, but weak enough to break free with a pen tip.
- Windway & Fipple: The air channel is fixed at 1.5mm high to compress the airstream before it hits the 45-degree splitting edge. Changing the fipple angle will dramatically alter the sound quality.
- Mounting Loop: The 5mm bore at the rear fits standard split rings and 550 paracord. If scaling the model for a heavier carabiner, reinforce the tail block first.
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