Printrbot Jr. Heated Aluminum Bed

These are Eagle v6.4.0 layout and pdf files for creating a PCB heatbed for the printrbot jr. The heatbed is mounted under a aluminum plate ([see here](http://www.thingiverse.com/thing:91504)) that acts as the printring platform.
In the PCB heatbed center is a little hole. Through this hole a thermistor is touching the aluminum plate's backside to measure the temperature at the plates center.
The PCB heatbed is cover with "plastik 70" spray for electrical insulation. (For PLA a heatbed temp