I built this to see if I could create an affordable but "professional" animatronic eye mechanism. It uses 6 Turnigy servo's (http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=31574), an LM8UU linear bearing (http://reprapworld.com/?products_details&products_id=151&cPath=1655), a piece of 8mm smooth rod, some push rods and ball links, some M3 hex cap screws, a four channel radio system (minimum) and the printed parts. All in all, anybody with access to a 3d printer could build this for less than 150 dollars. Here's a video of the end product: http://www.youtube.com/watch?v=UVtr4UqFMRY