Moving a surface from one side of an object to the other I am trying to make a minecraft mouth. If I went simple I would have no questions, or if there was a tutorial or a tutorial for blender at least. But me being me I have to make one of if not the best rig out there. I am new to blender so to all of you who answer my questions I appreciate it for taking your time to answer all these simple questions for one rig.

Here is the mouth before the move (The program the guy did this in is Maya, but most things are the same):


Then here is the mouth after the move:
Select the faces for mouth, press Y to split;





Press S > X > -1 to give it a mirrored scale along its X axis. Done. (or CtrlM > X)




P.S.: I'm not so sure about the word "rig" you mentioned here, suppose you are trying to animate it, then I suggest using Blender's ShapeKey feature in this case. Demo file included.