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This question already has an answer here:

For example, I have a human head model, which is cut in half, because i want to mirror it. But the problem here is that some faces are over the Y axis and some do not touch the axis. When I then try to mirror this shows up, where let's say some points don't touch and other ones, where faces are over the axis just collide. Is there a possibility to align the "edge" faces to a certain axis, so the mirroring becomes perfect?

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marked as duplicate by p2or, iKlsR Apr 27 '15 at 11:57

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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In the mirror modifier check merge and clipping : this will automatically aline and merge the vertices

enter image description here

change the merge limit if there is some gaps


you can also select these vertices and hit S+x then 0 so they aline on the Y axis

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