>> 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.
>

Not needed.

The inside_vector is required for difference and intersection to work 
properly with meshes, not for union/merge.
You can use a naked triangle or a polygon in any union/merge without any 
isue.

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