Moving BB8 Star Wars Droid

This model was derived from Daniel Lilygreen model found here.I have changed his inside structure so that whenever pushed over or rolled, he will stand himself back up, making a very fun desktop toy. His head also rotates. The BB8 Star Wars Droid is a fun little chap to roll around your desk and balance. For me this was a fun experiment with physics, maybe you could take this inside structure of this object and create your own characters like him.The inside structure of him can be found as a se