What I did is take the grey scale image and use it as a alpha channel in Zbrush then exported the STL to Vcarve.
I missed that zbrush step.
I am tired. not enough sleep cause I was testing something out last night. 
There is a freebie tool you can do this with that I posted.
It will take the grey scale image and turn it into a 3d object which you can then export to STL.
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