https://techcrunch.com/2021/02/18/sennheiser-partners-with-formlabs-for-customized-headphones/

3D printing has come a long way over the course of the last decade, but questions about mainstream adoption still linger around the technology. Medical devices have been a pretty compelling use case — they’re not really mass produced and require a high level of personalization. Clear orthodontics are a great example of something that falls in that sweet spot — in fact, dental in general has been a big application.

Audio, too, holds a lot of potential. Imagine, for example, a set of headphones custom designed for your ears. The technology has been available on high-end models for a while, courtesy of molding, but 3D printing could unlock a more easily scalable version of that kind of luxury.