Monday evening my mother mentioned her car key was broken, I measured the broken parts, printed up two prototypes, and printed out a fully functional replacement the following morning.If you need a similar key fob replacement, use the "key4f.stl" version. The rest are if you want to tinker with them. :)The saga of the replacement key fob: http://blog.makerbot.com/2010/11/16/makerbot-hero-car-keys-part-i/ http://blog.makerbot.com/2010/11/16/makerbot-hero-car-keys-part-ii/ http://blog.makerbot.com/2010/11/17/makerbot-hero-car-keys-part-iii/ http://blog.makerbot.com/2010/11/17/makerbot-hero-car-keys-part-iv/ http://blog.makerbot.com/2010/11/18/makerbot-hero-car-keys-epilogue/1) Print 2) Place electronic key beeper and key inside new key case 3) Snap case shut 4) Replace screw to hold key in place