This thing was made with Tinkercad.

This is the result of my intuitive understanding of how whistles are put together. There are a number of parameters that may or may not make this work. So, while I wait for my Printrbot to arrive, I am hoping someone with either print this or a derivative and let me know how it works.

The things that I think affect a whistle's ability to make a sound:
-size of aperture
-angle of air flow (currently tangent to aperture)
-angle of edge that "cuts" airflow from mouthpiece
-volume of whistle (pitch)