An eye moved by two servos drived by arduino The dimension is about 150 mm pupil diameter. You can see a video of the moving eye at: http://youtu.be/dFKZuC5NHL0The eyes are for two big carnival trees. Pupil and eyelid are made of papier-mache, but can also be 3D printed. The base plate is a solid piece of wood on wich you can screw all the 3D printed parts. The metal_pin is a 154 mm long, 6 mm diameter rod. Eyelid servo is a standard servo (Hitec HS-311), pupil servo is a smaller one (Hitec HS-81) If you pair left and right eyes with a small metal rod, you need only 3 servos for the full eyes movement. A 5 volts Arduino Pro Mini is the only electronic needed to pilot the two eyes. The servos are direct connected to arduino pilot pins with the yellow cable. The same 5 volts power supply can drive Arduino and servos. The attached Arduino sketch is commented so you can make your own modification to eyes movement.