Thanks for the answers, here is the link of my scene:

https://www.dropbox.com/s/au2t9g5l7btmhqu/Block3D.png?dl=0

As you can see, some faces are shared between two cubes.
The whole block is defined by one "mesh2" object, in which I have defined
several triangles to make a cube. The whole block is made of these cubes.
The problem is, that I have a transparent block and I would like these inner
faces do not appear. I have also tried to apply the "merge" function to my whole
block but it didn't work.

I'm looking forward to read you.

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