The Normal earbuds are a pretty wild product. Using their iPhone app, you take a few pictures of your ears. Then, they 3D print the earbuds to be a custom fit. If they don’t quite fit, you take a few more pictures with the earbuds in place, they’ll make adjustments and ship you new ones.

Tyler Hays wrote a review of the whole process and the earbuds themselves for Tools & Toys.

Review of Normal’s 3D Printed Earbuds