So you've gotten your hands a handcuff key to print in case some vagabond cuffs you to a table conveniently within reach of your trusty Makerbot. But what if, using your newfound freedom, you find yourself at liberty to turn the tables and show them what the powers of nerd rage, extruded nylon filament, and Greyskull combined can achieve? This is a functional pair of handcuffs that you can print out in the comfort and privacy of your own home.
Ferret7 printed one out! http://www.thingiverse.com/thing:1300 Awesome!
I just polished off a working model. Take a look here: http://www.flickr.com/photos/gianteye/sets/72157622866071790/
Download the RAR package. All the parts labeled "a" are arranged to print together. The same goes for all the parts labeled "b". Print two of each set and you'll have a complete pair of cuffs. I've also included the parts separately.