Euphonium/Trombone Small-bore to Large-bore Adapter

I have a few small-bore mouthpieces, but my euphonium is a large-bore instrument, so I decide to print an adapter so I could use my other mouthpieces on my new instrument. Let me know if it comes in handy!

BEWARE: If it is printed as shown, the layers may not support each other and may break off into the instrument. Print sideways with supports if you are worried your layer adhesion isn't good enough.