3D is definitely the rage and will change the face of manufacturing all over. The problem in 3D eyewear is the sizing, as you have fronts, bridges and temples, all which should be fitted to your face for maximum comfort.  New company MONO thinks they have solved the problem with three sizes. Now on Indiegogo they are looking to raise $30,000 USD.
Mono 3D Eyewear

Coming in five different shapes, each is customizable by colors as well as in the lenses. In fact the lenses are interchangeable. You just pop them in and out. The other advantage due to the 3D printing is it is only one piece. Meaning, no separate temples and parts. Even the nosepads are built in. The temples are designed to be flexible and foldable.