13 year old Clay Haight made this sub-100$ dollar simple wearable eye display. There are many other DIY Google Glass projects that involve 3d printing, but non with such a young maker.
From the source:
Clay’s DIY “Google Glass” uses the sensors on the Arduino Esplora along with the Arduino LCD screen and a 3D printed frame.
He can use voice commands to bring up a calendar with his schedule, local maps, and temperature and weather info.
A headband on the back keeps it from tilting to one side.
“Now they are extremely comfortable,” says Clay. “In fact I wear them around my house and tell my parents the temperature just for fun!”
Source and more info: http://makezine.com/2014/07/16/diy-google-glass/
Here is a similar project: http://diy3dprinting.blogspot.com/2014/07/3d-printable-low-cost-foldable.html