With 3D printing and CAD, you can pretty much come up with any idea you deem interesting. For example, the Ruiz brothers designed a “Batman utility belt” inspired wristband that can hold a number of tool bits and and audio adapter – In my case, I kept loosing my audio adapter [for the iPhone 7] so now I fit it onto my wristband and can carry it around with me. A simple solution for an otherwise simple problem.