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So I have a uv,unwrapped cube, but when I use the extrude tool to make part of it stick out, the sides of the extruded segment have different uv wrapping, which causes issues:

enter image description here

It looks like that because those sides are exactly between a red and transparent pixel. Is there any way to fix this? I need to extrude about 120 of these faces.

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    $\begingroup$ What I see there is overlapping (duplicated) faces, creating Z -fighting. In edit mode press Ctrl+V and select Remove Doubles. Also as workflow is better to edit the object first, and then UV unwrap, as modifications on the geometry will affect the UV mapping. $\endgroup$
    – user1853
    Commented Apr 29, 2016 at 0:09
  • $\begingroup$ There are no doubles there, actually. What's happening is the side faces of the extrusion have a uv map where it is directly between a red and transparent pixel. I want to extrude so that the side faces don't have a different uv map placement than the face im extruding from (if that makes sense). $\endgroup$
    – Zac Perry
    Commented Apr 29, 2016 at 3:48

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If you are extruding along an orthagonal direction, you can press e to start extruding and then press g g (g twice) to continue extruding the edge while automatically updating the UV coordinates for the extruded face(s).

Extruding with 'e' followed by 'gg'

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