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Why would a cuboid with seams as shown unwrap as a cube? I eventually found one tutorial example of a cuboid rather than a cube being unwrapped. Its result as illustrated in the article was as expected but in 20 attempts I could only reproduce it once. All the other attempts with different seams, different unwraps, renders etc produced a cube's unwrap.

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    $\begingroup$ My guess is that you scaled a cube to a cuboid in object mode without applying the scale. Try hitting Ctrl A followed by S in object mode, and see if that helps. $\endgroup$
    – user27640
    Feb 19 '17 at 22:30
  • $\begingroup$ What is the exact purpose of object scale?: blender.stackexchange.com/a/64598/7777 $\endgroup$ Feb 19 '17 at 23:28
  • $\begingroup$ Yes, thank you, I had not applied the scale. Now into hours of diversion to understand another accidentally discovered fundamental. $\endgroup$
    – ragim_w
    Feb 20 '17 at 7:28

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