This is a Makerbot printable Dan Moi*, which is similar to a Jew's Harp**.
I modeled it off of a brass bass Dan Moi, but the sound is much closer to a bamboo one. While this will not replace a nice brass Dan Moi, you can print this on a well-tuned Makerbot!
Here is a YouTube video of the Dan Moi in action: http://www.youtube.com/watch?v=enHMpn5SC5w
Since I can't seem to do links properly:
A well tuned machine should be able to print this out with no finishing. Depending on your tuning however, you may have to finish this a bit more to get the gap correct. I recommend carefully using an x-acto to get the extra bits off, and then finishing it with a very fine sandpaper. The tongue should move freely, but the gap should be minimal.
You play this like any other mouth harp. It should be touching your lips, and the tongue should be able to freely move. Pluck the end, and you should hopefully be making some sounds.