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Thank you for your quick answer.
And I confirm, as I said in ma last comment, that this is due to the dampener on the motor: when putting the belt unser tension the motor goes against the frame.
When removing the dampener your frame is Perfect.

I know you have done another piece for the X motor mount carriage. Do you think it would be possible for you to provide me this piece, by putting the motore a few milimeters away of the frame? If so I will post a comment on the mount carriage piece.

Thanks in advance for your support (if it is possible)