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In the Blender reference manual page "Subdivision Surface Modifier", in the "Combination" section, there's a file called WoodBlock.blend that apparently shows that you can use the subsurf modifier only to make a hole in a mesh. Can it be done with only a subsurf modifier? I tried to do it myself using my own mesh and with mean creases, but it's not turning out as I expected.

enter image description here

The edges of the hole I made aren't round like the ends of the mesh are (and like they are in Woodblock.blend).

I see that there's a similar question to this one, but I don't know if that person used a boolean modifier to make the hole itself or used a subsurf modifier.

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  • $\begingroup$ They have been creased. I believe it is Shift-E to crease/uncrease an edge in editmode $\endgroup$ – VRM Aug 6 '15 at 0:04
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What you see in the manual example is currently (2.75) still achievable (and probably will be for long time..).

If your test has not the same result, maybe you should check the mesh. Notice in the image below how the presence of an additional vertex near the cursor led to a non-rounded edge (as like a loopcut would do) while in the other side the edge is rounded.

enter image description here

You may want to remove doubles, look for hidden vertices/edge/faces, check topology in general...

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