MPSM Heatbed Hack

This made is based on the tutorial from Dave White in Hackaday webpage:

https://hackaday.io/post/44045

I thought it would need some more details so thats the reason of this post. I had some troubles finding the heatbed mentioned in that tutorial, below you can find the link to it:

http://www.ebay.com/itm/4-5-X-6-Heatbed-PCB-Heated-Bed-for-3D-Printing-/261195426302?hash=item3cd075e9fe:g:I8cAAOxyW9RRXFdh

Please check that I only found it with the seller 3dheatbeds. Great HW what they