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Instead of tediously straightening all the edges to align perfectly vertical one by one by one, is there some way to straighten out ALL the UVmap vertices ALL at once (like on the left side all nice nice vertical) without having them mashup and overlap into one --as with happens when I select them all and type S + X + 0?

enter image description here

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  • $\begingroup$ how did you unwrap your object? $\endgroup$ – user1853 Feb 5 '16 at 18:29
  • $\begingroup$ Cylinder projection - I tried almost every unwrapping option and that seemed to be the best, albeit still a little slanted as you can see. $\endgroup$ – Marc Feb 5 '16 at 18:37
  • $\begingroup$ try uvsquares $\endgroup$ – sambler Feb 6 '16 at 5:57
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I would just redo the UV unwrapping to get it straight.

Starting with a cylinder.

Select an edge. enter image description here

Mark it as seam.

enter image description here

Select all faces.

enter image description here

Unwrap (no special projection, but a straight unwrap).

enter image description here

You should have a straight UV map like this:

enter image description here

Then just scale it to meet your needs.

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