> Here is a very simple example with just two cubes which share a common face:
>
> Link to the image:
> https://www.dropbox.com/s/rfkcvxlerko3qmw/Mesh2%28merged%29.png?dl=0
>
> I have used the "merge" function to merge the two cubes, but as you can see,
> the shared inner face still appears.
>
> I have defined two cubes as follow:

You must add an "inside_vector" to the mesh2 objects if you want to use 
them in CSG (eg merge). Try adding "inside_vector y" to each mesh2 and 
the inner face should be gone.

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