I wanted to model and print a compact, rugged, and loud whistle for emergency survival or rescue use. I was particularly interested in a whistle that could be taken SCUBA diving and then used for signaling a watercraft on the surface.
This whistle is:
It also can be printed quite quickly and inexpensively. I printed it with the largest (top) face down without supports. To increase strength and prevent cracking at the higher pressures associated with diving, I used 100% infill.
The design is inspired by a popular commercially-available survival whistle intended for marine use.
The author marked this model as their own original creation.