This is one of those useful multi tool things that is quick and easy to assemble with minimal parts.
Options: Cutter, LED & Whistle (Strong, Small, Durable)
2 X M3 X 6mm L (for blade)
1 X M3 X 14mm L + washer + Lock Nut (Blade mount hinge)
1 X CR 2032 3V Battery + 5mm LED
THE LOUDEST WHISTLE ON THINGIVERSE: https://www.thingiverse.com/thing:2933021
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Dedicated to Garfield, RIP my little companion, you will never be forgotten