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this is maybe what you are searching for -> http://www.thingiverse.com/thing:361307
I’m using a modified version of this thing to be able to attach the glasbed to an underlying surface that has the same dimensions as the glasbed itself. So there is no need to make holes into the bottom surface anymore.
Yes, I’m not using an extruder heatsink because it is simply not necessary. Yesterday tested with a big print over some hours. Everything is fine. You just have to finetune the steppermotors poti to have exactly the right current.
Allted described it very good how to do this for your MPCNC build here -> http://www.vicious1.com/forum/topic/stepper-driver-current-limit-parallel-stepper-motors/