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I am a complete beginner in blender, so my question may turn out to be trivial.

I have a cylinder with some square-ish elements slightly carved into it, as you can see in this screenshot

as you can see in this screenshot

All of the edges of the squares have a mean crease value of 1: enter image description here However when i apply a subsurf modifier the result looks like this

like this.

What should I do to keep the edges straight when applying the modifier?

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    $\begingroup$ Hmm, rereading your question, you say all the edges are creased. Can you post a screenshot in Edit mode so I can remove or update my answer accordingly. $\endgroup$ – iKlsR Nov 2 '14 at 23:06
  • $\begingroup$ you need to crease the inner corner edges. $\endgroup$ – David Nov 2 '14 at 23:12
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    $\begingroup$ @iKlsR: done, as you wrote the problem were the inner edges, thanks for the quick answer and the bonus tip! $\endgroup$ – user7790 Nov 2 '14 at 23:14
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Make sure the inner edges are creased at the corners as well. For example:

With only outer edges creased

enter image description here

With inner edges creased

enter image description here

As a bonus, you might want to drop an Edge Split modifier on as well to get your object smooth and remove the stretched shades that creasing and subsurf will produce. Also see How to smooth shade an object while retaining hard edges?.

enter image description here

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