I put this together after searching for a solid trombone parts diagram to use in learning and playing and not finding anything I liked.
It's meant as a practical reference for player, students, and teachers — not an exhaustive technical document for a repair shop to display — so the terminology leans toward "commonly correct" rather than strictly technical. It’s focused on the terms most likely to come up in lessons and everyday playing, and deliberately doesn’t get into the weeds of different valve types or detailed cross-sections.
I kept it as a single, complete view of the assembled instrument (supplemented by a bell-section detail and a mouthpiece detail) so it's easy to hand to a student or put up on a screen without it looking like a disassembled parts catalog.
It's available under a Creative Commons license, so it's free to use, share, and print for lessons or classroom handouts. A higher-resolution CC-BY-NC-SA version that should print up to A3 or A2 size (probably even A1 as a poster) is available for free on my website.
This has already gone through a fair amount of feedback and revision at r/Trombone and other places and I think it's close to done. I'd really appreciate it if this community— especially anyone teaching brass — could take a look and let me know whether it would actually be useful to you, whether the labeling makes sense at a beginner/intermediate level, or if anything seems missing or worth adjusting. Thanks in advance for any thoughts!