ELF: The Solar-powered motor-pedal-hybrid trike!
A little model of a local project from my hometown. I tried to make it mobile, but... that didn't quite pan out. You can still put the wheels on and have it look good, though. There are two versions: a full version and a lower weight version which also has the ELF name on the side. I didn't actually print the lower weight version so I can't guarantee it will print.
http://organictransit.com/