>> 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 output is different depending whether you use inside_vector or not, 
so either you definitely must use it for the correct result, or you 
definitely must *not* use it for a correct result... I've always used it 
by default for meshes as I wasn't aware using it could do any harm!

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