Quote:
Originally Posted by Rawk777
The copy paste trick doesn't work well for me. Some faces becomes weirdly inverted, even if the two pieces have the same configuration, on the same object. Maybe thats because its different parts of the same objects  .
Does it always work the way you want retardedmonkey ?
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Andrei is right on

If you are going to be using the copy/paste make sure that you are doing on the SAME EXACT piece. It is good to get into the habit of deleting everything that is duplicated or will just be pasted on the uvs. So if you have a wheel duplicated 7 times, you dont need all seven wheels...it is better to delete all the wheels except one and just duplicate them.
The copy/paste will not work if-
A. You do not have the full element selected. You must have the same exact selection on the target object as you did on the object you are copying.
B. If the geometry has been cut, or new edge loops put in. I find it quite rare for it work after changing it in that way.
C. If you have used mirror/symmetry. Those 2 will screw you over....the way to fix that is to delete the symmetry modifier > unwrap > reapply the symetry modifier.
As I said though, typically I will just collapse the uvw modifier and just duplicate the part instead of copy/pasting.