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When I use the subsurf modifier with the boolean modifier, the model looks weird

With boolean only:

enter image description here

Boolean and subsurf modifier:

enter image description here

Check the video to see what I mean https://www.dropbox.com/s/su496cek5o2pn9e/2018-08-27%2020-59-05.mp4?dl=0

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Boolean operations always messes with the topology of the mesh, you can go around this in some ways, but the best practice is to invest in understanding topology, and how to create the best topology for Your model. In this Example, I would make the model without the boolean modifier and do something like this:

Without subsurf

enter image description here

With subsurf, and edge crease on the edges to create sharp edges.

enter image description here

If you want to learn about topology, the anvil series by Blender Guru is quite good. He also addresses the issues with the boolean modifier and the topology (in part 2).

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