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?

Yes, the Shell modifier in 3dsmax works the same way, and could be used for the same purpose, to lower the cost of a 3d print.  The Create Shell option in Netfabb is very good as well, but I believe it's only available in the full version, which costs around $900. The Solidify modifier in Blender can do the job just fine, and in most cases, do an even cleaner job of hallowing out a model with wall thickness.

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