Small shank trombone/baritone mouthpiece. Dimensions are close to a 6.5 AL mouthpiece, but not exact. Still plays like a 6.5 AL though. If the model is super tiny when you open it up in the slicer, just change the scale from mm to cm (multiply by 10). Be sure to rotate the model so it is sitting on the cup, like in the first picture. That way, no supports are needed. A raft will help though.Printer Brand: PrintrbotPrinter: Printrbot PlusRafts: YesSupports: NoResolution: 0.2 or finerInfill: 15%