About this 3D model
Did you purchase the "Windup Walker" at Makerbot.com (http://store.makerbot.com/windup-walkers.html)? If so, you can remove the windup motor and build your own "T-Rex Windup Walker". Video of "T-Rex Windup Walker" on YouTube at "http://www.youtube.com/watch?v=anOImtxokow". Designed using Sketchup 8 (free version), and printed on a Replicator 2 in PLA using Makerware.