PCB heated print bed

PCB heated bed. I'm working on this idea for nearly two months, inspired by http://www.neufeld.newton.ks.us/electronics/?p=864 .

UPDATE
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tested at 110W and its working flawlesly, gives 108°C in few mins
Now I'm working on great mounting solution

This is V4
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- 22x20cm hated area
- you can select what resistance you want 1.3ohms (110W at 12V) or 21ohms
- you dont need any steel or aluminium on top, just plane kapton tape

(I'm testing it at 21ohms setup with 55V P