Here is "InMoov", the robot you can print and animate. You have a 3D printer, some building skills, This project is for you!!
Remember this, all these parts are under a non-commercial license, see the terms.
This is the eyes mechanism which can be added to the head.
A bit of history videos:
Last of all:
Print all parts. Mine are done with ABS.
I used 3 DS9229HV servos from Hobbyking.
I have two different cameras set in the mechanism. The support plate is set far enough to mount different sorts of cameras, hopefully.
My cameras are a Hercule HD Twist and a Megapixel webcam. Both don't exceed 11 euros. I dismantled both of them to keep the minimum of stuff.
29/12/13 Update, I added printable eyeball, I got inspired by Jhack's model(http://www.thingiverse.com/thing:122502), and designed a wider pupile and adapted casing for my cameras.
Update 08/07/14 Modified EyeMoverSideV3 to EyeMoverSideV4, this new parts lets you choose the eyes X angles position.
You can follow the assembly tutorial under the section Eye Mechanism.