Heat Distribution on Heated Bed

[ex-egll]

Did some voltage measurements, not quite what I expected as there seems to be a greater loss towards the back of the board, i would have expected a more linear loss.

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BACK
Bed Volts.jpg
Front

Just finished up running some 12 gauge wire around the outer traces, soldering to the bed at the positions of the red X's in the diagram. Vast improvement, temperature difference on heating is only 3 degrees back to front and the voltage drop from back to front is now 0.15v vs 2.0v previously. Heat-up time has improved as well.