Trombone Mouthpiece prototyping
As we recently got a 3D printer - namely a BambuLab A1 mini - I am still printing stuff for fun. In the end this is what 3d printing hobby is mostly about and you often learn something new about it as well from doing it more often.
We had some adhesion issues at first, which were solved by using Isopropanol (isopropyl alcohol) to clean the print bed. There were also some flow dynamics issues at first which were only solved by a manual calibration which is available in BambuStudio.
Now everything works well and I can try out some 3d printed mouthpieces for the trombone, just like this one:
https://makerworld.com/en/models/1545569-trombone-large-shank-mouthpiece

Trombone mouthpieces printed with a BambuLab A1 Mini. Some are resized models from trumpet mouthpieces
Trombones either have a small shank 10.85 mm (0.427 inches) or a large shank of 12.73 mm (0.5 inches) 1. A trumpet has about 9.78 mm (0.3850 inches) shank size Scaling factor is 1.30 which works well.
There is this mouth piece for two people playing one horn (or trombone) together: https://makerworld.com/en/models/1439931-trumpet-mouthpiece-two-people-one-horn
There is also the other way around for one person playing two horn from the same creator:
https://makerworld.com/en/models/1152311-trumpet-mouthpiece
In general these mouthpieces are not the best, but are a very nice and fun thing to prototype.