an octave of tiny organ pipes

After I posted the organ pipe whistle http://www.thingiverse.com/thing:311 two years ago, I designed a full octave of pipes and told myself I'd post the files just as soon as I cleaned them up a little. Well, it took a few years, but I finally got around to it.

These files contain 13 organ pipe whistles, not tuned to any particular standard, but they're pretty much in tune relative to each other. The files are partly optimized to reduce the number of cuts by sharing long flat edges, but thi