Website: thingiverse
Author: LetsMakeThings
Price: Free Download
File format: .Stl 3d printable
Description:
For the loudest results, print the whistle on its side.The Echo whistle started as an idea to create the loudest whistle for a 3D Printer and create a more compact survival whistle. This whistle is designed for the person who wants a easy, compact and loud whistle for any situation, ranging from survival to referees.Testing