Tuba mouthpiece and booster cup (small shank)

thingiverse

I'm building my first 3D model ever and to be honest I haven't even measured the cup size accurately because I just have some free time available here at work. The booster cup adds extra mass outside of the mouthpiece to produce a warmer sound right from the get-go. There's also a slot on the inside of the booster cup for inserting an o-ring to make sure the booster stays securely in place, but surprisingly I didn't experience any issues with it coming off at all; it fits really snugly. Please note that this design will only work with instruments having very narrow shank mouthpiece tubes! Here's a simple step-by-step guide to build your model. I created it using Autodesk 123Design.