This "little" guy is meant to be printed hollow and have the bottom circle cut out to place a tea light inside. I used one of these RGB battery powered tea lights: [http://amzn.to/1Ri7xH4] (http://amzn.to/1Ri7xH4) It fit snugly after cutting the plug out. Printed in Makerbot Translucent Blue filament (I know, I know...). My Daughter slept with it next to her bed... :) https://www.youtube.com/watch?v=2s6K3JaPmPoremixed from: https://www.youmagine.com/designs/ultimaker-robot