Breath Flute

**Breath Flutes** are musical instruments that are very easy to play - they have no finger holes and you play the instrument with your breath. They are in a class of flutes called "_overtone flutes_" which change pitch based on how much air pressure you provide. They are useful in community music sessions as well as in music therapy, therapeutic music, and a wide range of personal breath practices such as yoga and meditation.

The Breath Flute Project is a GPLv3 Open-Source project that provides a highly parameterized OpenSCAD model as well as 100+ pre-rendered STL files of various options and configurations. The release package also has **extensive** documentation (over 300 pages). Here is a [direct link to the Developer's Guide](http://breathflute.com/pdf/BreathFlute_DevelGuide.pdf "Developer's Guide") (63 pages / 1MB).

The various STL files let users print the 5" tall headjoints as well as custom sanding tools to facilitate post-processing. You add 3-4 feet of 1.25" PVC tube to