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So far i have been modeling by making both sides of a model but i got annoyed have to make exact changes to each side. Is their a way to make only one side of the model?

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Yes there definitely is.

You can use the mirror modifier, this will mirror your model across its origin (or any other object's origin) and merge the vertices along the seam if you want as well.

To do this first add the mirror modifier to the object in the modifiers panel.
enter image description here

The entire mesh will be mirrored across the object's origin along the selected axis.
enter image description here
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You can tell it to merge the vertices along the seam by checking merge and adjusting the merge limit to set how close together vertices must be to be merged.

If you don't want to mirror across the origin you can use any other object's origin as the mirror point. I usually use an empty, an empty is just a non-renderable object that is used in situations like this.

To do this first add an empty under Shift+A > empty > plain axes.
enter image description here

Then select the empty in the mirror object dropdown of the mirror modifier.
enter image description here
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  • $\begingroup$ Might be helpful if you could add some images/steps as to how someone could do this. $\endgroup$ – Ray Mairlot Nov 16 '14 at 18:47
  • $\begingroup$ @Ray Mairlot I am working on them right now :). $\endgroup$ – PGmath Nov 16 '14 at 18:47
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The best way to do it is mirroring. But there is an allternate method :).

Select the whole mesh and check the 'X Mirror' and 'Topology Mirror' in the 'Tool Options'

enter image description here

Now when you edit one side of the mesh the other one behave the same. enter image description here

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