Don't print this thing by itself! This is a boolean punch, a modular functionality. It creates a negative space which adds a function to another object. In this case it turns your object into an led light. See Glowda:the glowing Yoda for an example
Use Blender or a similar program to boolean this shape out of another object. Then insert an LED and a 2032 lithium battery. You may need to play with bending the wires to make good contact. Check your polarity before pushing the battery all the way in.
Take your basic Yoda head and boolean punch an led and a 2032 lithium battery into the bottom and you get Glowda.
See http://www.thingiverse.com/thing:241887 for the boolean punch to make anything glow.
For best results print in yellow glow-in-the-dark and use a UV LED. That really makes Yoda pop with a cool radioactive glow.
More details on my blog: