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I'm (almost) a complete newbie in Blender. I thought that modelling a greek column would be a great exercise for me. My mesh doesn't look so bad, but when I subdivide everything, some strange artifacts appear :(

Here is an example: enter image description here

Also, here is a link to my .blend file, so you can see the mesh: .blend file Could you give me some advice how to remove those strange things? :/

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  • $\begingroup$ In Edit Mode without any vertices selected, press Ctrl+Alt+Shift+M to select all non-manifold vertices. You have to fix these... $\endgroup$
    – Samoth
    Commented Apr 13, 2016 at 13:51

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Your problem is that along the object you have large and ugly ngons (polygons with more than 4 vertices). Ngons don't work so well with the subsurf modifier.

Use quads instead to connect all of the other vertices, that will give you a nicer edge flow:

enter image description here

enter image description here

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