Flat EDC Safety Whistle Keychain - No Supports

A pocket-flat safety whistle that clips onto your keyring without adding bulk — no pea, no rattling ball inside, just one clean, piercing blast for hikes, dog walks, emergency kits, or a kid's backpack.

Print time: ~18 min · Filament: ~2.6g PLA · No supports, single plate, ready straight off the printer.

Why it's loud
Internally tuned to ~4kHz — the frequency band human hearing is most sensitive to — through a dual-channel windway, cutting through wind and background noise better than a typical single-chamber whistle.

Specs
14.7 × 49.1 × 4.0mm · fits any standard split keyring through the oval aperture · 100% infill recommended · chamfered corners · pealess (no moving parts to freeze, rattle, or wear out)

Print Settings (embedded in file)
Nozzle: 0.4mm · Layer height: 0.2mm · Walls: 4 · Infill: 100% · Supports: None · Profile: Whistle (included)

Usage
Blow across the short end. Works with any standard split keyring or carabiner.

Got a favorite keyring combo, or a specific use for it — hiking, dog walks, kids' bags? Drop a comment, I'd love to see how you carry it.