Parametric Music Pipe Trumpet Trombone Bugle Clarinet Free 3D print model

After my Parametric Customizable Brass-intrument Mouthpiece, I'm looking if I can actually print a Trumpet. This is the first step: Make a pipe of the right shape. Feel free to play around if you get how it works.

physics background....
This guy perfectly explains why trumpets have this shape:
http://www.youtube.com/watch?v=cEr1OH6-77M
And he proves a plastic trumpet could sound reasonable.