Trumpet Buzzing Extension

Berp is famous for it's buzzing extension. Instead of paying for their $15-$20 piece of plastic, here is a different design based off a different company's buzzing extension.

Goes straight into the lead pipe, mouthpiece fits in the other end.
I had some problems with the calibration of my printer, since all needs to be perfect. You may need to scale it up a few percent.
Either way, the Autodesk Inventor 2015 .ipt file is uploaded.
(Free 3-year trial for students)
Might add a resistance piece sometime..