Ok, Lux, am I understanding you right that you are suggesting the Solidify modifier as a way to add wall offset thickness, instead of using something like Meshlab or Netfabb? Is it just a matter of applying the Solidify to the top of the finished model, or is there any extra steps involved?  What settings are best to use for this?

Nevermind... I tried it as I was writing this, and I see what you mean!  Once you have the complete, solid model, with all modifiers collapsed, you can apply another Solidify modifier to the object, and it creates a surface offset to the object, which I assume the 3d printer will interpret as inner walls.   Bingo.  This seems to work similar, but even better, than the "Create Shell" command in Netfabb Pro.  Any tips on what settings are best when creating wall thickness with this modifier?  I assume the same thing applies in 3dsmax with the Shell modifier?

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.