The Printrbot heated bed doesn’t have a decent cable management system so here’s a cable chain that feeds lines from under the printrbot to the heated bed.
Remix of chain link from http://www.thingiverse.com/thing:11978 with a flattened bottom for ease of print. * Chain links remixed with easy-snap connector. * Heat bed mechanism slides in over the wires and snaps onto heat bed. * Heat bed mechanism has holes for wire tie to provide strain relief. * The bed bottom protects the wires from under the Printrbot but requires feet on the Printrbot to raise it 3mm. (e.g. http://www.thingiverse.com/thing:936854)
Files and details are available at https://www.thingiverse.com/thing:956108