**update Dec 23, 2014 - Uploaded a thicker whistle which can get louder notes
An improved Shepherd's whistle with a handle to thread a string through and hold while playing.
A whistle commonly used by Shepherd's for giving commands to dogs. These things require a bit of practice to use, but can be very loud and fun once you get the hang of them. Once you get good at playing it, you can make many different tones with it!
If you don't know how to play a shepherd's whistle, this guy does a short explanation and then plays one very nicely: https://www.youtube.com/watch?v=Mv66viUCn1Y
Optional sound improvement:
After printing run a utility knife through the open slot of the whistle to get rid of any thin strands of plastic that may have worked their way in there when printing. You can also try sanding the outside flat surfaced with a medium grit (#120) sandpaper and then move on to extra fine grit (#240).... but it's not really necessary.
Printed on Printrbot Simple Maker kit (1405)