Powerful and compact emergency whistle for hiking (5 designs)

cults3d

I designed this whistle with a simple goal, to be powerful, simple to print and small enough to have as a keychain or in the first aid kit. several models available: with a clip to easily attach to the backpack (width of the clip 21mm) with a loop to attach it to a key ring or a wire with loop and clip new model more compact and more powerful (Final cut) and for each model with or without the SOS message