Heatbed 120mm,x 120mm

This is a prototype of pcb heat bed designed for sobo84. In this time is only design (not tested).
Published ZIP file contains two version of heat bed. One for 12V supply. And second one for 24V supply.

Working area: 120mm x 120mm
Mounting holes are 130mm x 130mm apart.
Total size of PCB is 145mm x 145mm
Use 1 side PCB with 35um thick copper

Theoretical power consumption is about 72W

Edited (8/10/2015):
Added gerber files for both heatbed PCBs.