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X mirror works perfectly for editing geometry, but when wanting to extend / extrude areas, x mirror no longer continues mirroring.

Are there additional tools or options one should check in order for it to respect extruding, cutting etc

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    $\begingroup$ The X-Mirror relies on topology for correct work and hence has some limitations, extruding is one of them (as there aren't vertices with exact same local coordinates as extruded one on the other side of the mesh). It might be more efficient to use Mirror modifier instead. $\endgroup$ – Mr Zak Jul 25 '17 at 13:31
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    $\begingroup$ Agree with that, use mirror modifier if possible. $\endgroup$ – Pyros Jul 25 '17 at 13:36
  • $\begingroup$ Using the mirror would mean needing to delete half the model, right? Unless I could use the duplicate then just remove double verts. when applying the mirror... $\endgroup$ – Andrew Lazarus Jul 25 '17 at 13:37
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    $\begingroup$ You should be able to just remove doubles after, but if not then yes, you will have to delete half the model. $\endgroup$ – SchoolBoy Jul 25 '17 at 15:15
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X Mirror only works when manipulating vertexes, edges and faces in position scale and rotation.

For any work such as extruding etc, it breaks out of the mirroring tool and will no longer be symetrically affected.

To continue working with a mirrored object, you will have to delete all of the vertexes on one side of the model and add a mirror modifier.

Select the view all vertexes without clipping button:

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Select all the vertexes on either the left or right of an object, but avoid selecting the vertexes down the centre of the object, (you'll need these for flipping it)

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Delete these vertexes and add a mirror modifier:

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You'll now have an object that is perfectly mirrored. If it doesn't look right, make sure you've got the right axis selected in the mirror modifier.

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