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 http://www.thingiverse.com/thing:241884 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. More details on my blog: http://www.the3dprintedfuture.com