My son wanted a plastic mouthpiece and we are using this one to try out different internal shapes to see how they play. This is his favorite shape so far and it is
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loosely based on the Olds 3 mouthpiece, in that it has a shallow cup and is slightly narrow. I use food safe PETG and sand the rim while spinning it in a drill to get it as smooth as possible. This is far from perfect but it produces a functional mouthpiece when you get done, hope it works for you.
