Seth over at Berm Peak Express has a rabid following of DIY enthusiasts. Seth’s whole channel is largely about either teaching riders how to do cool stuff themselves, or showing off what’s possible if you can. In that sense, 3D printing is a super obvious direction for BPX to go in.
So, he had his audience send in some bike parts they designed and 3D printed and some of them are supremely cool. Check it out.