Quote Originally Posted by Marcus View Post
Yes ;-) But the point was most things on thingiverse and other sites are designed as solid models, hollowing out can sace material cost :-)
Since we won't be using any slicing software, and everything will be done directly in Blender, there is a built in modifier you can use to hollow out any manifold object. It's called Solidify. You can configure exactly how thick you want the walls to be, along with other options.

It won't be too difficult to just take any Thingiverse object and make it hollow, you just have to make sure the model is manifold (e.g. closed with no holes or floating parts) and that can be done using ctrl+alt+shift+M in blender to auto-manifold things.