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Model has been updated as of 10/8/14 to account for thin wall issues in some polished materials.
Modeled after the earpiece Peter Quill wears in the Guardians of the Galaxy movie, the earpiece seems to allow Star Lord to store his helmet away and deploy it at will with the push of a button. This version has been prepped to work with standardized components in order to allow you to install LEDs and make your own working version!
This has been sized to fit even large ears, and has a wedge-shaped design that should allow you to snugly fit it on without spirit gum if you want an easy wearing experience. The two large cavities inside the main body of the earpiece are designed to house 1.5V cell batteries - specifically, I designed them for the commonly-available LR1130 / AG10 coin cell battery. The hole by the ear lobe is sized to fit a 3mm red LED. There is a square hole cut in the back of the earpiece to fit your standard 9mm slide switch. I also left enough room inside the body of the earpiece to fit a resistor - I used one between 600 and 700 ohms, which is enough to dim the LED down to acceptable levels. Depending on the LED you use, you may or may not require a resistor!
The secondary piece is a back plate that holds the coin cells in place. I trimmed a paperclip and glued it to the back of mine to join contacts across the two batteries so that the 1.5V cells were in series as a 3V source. The back attaches pretty snugly, but I also sized it with two screw holes to accept M2x4mm long screws.
I printed a copy for myself on my home 3d printer. Shapeways has some thin wall warnings on this part, but they can't be fixed without also interfering with the space needed for the batteries. I'm pretty sure it'd come out fine, but be aware!