Reply To: I can’t get rid of these bumps
That is because of the way that the Catmull-Clark Subdivision algorithm works.
Look closer at for instance your triangle:
Subsurf takes the center of each Face and connects it to the surrounding Edges. Then it smoothes everything out.
Now the other (not in the triangle) points get ‘pulled down’ more, hence the ‘bump’.
The principle, seen in 2D, is this:
(It is slightly more complicated, because Blender, by default, smoothes out more, as if there were infinitely many subdivisions, but forget about that…).
Avoid triangles when using the Subdivision Surface whenever possible and when you must have a triangle, place it there where it ‘can’t do any harm’.
I’d get rid of the triangles in your example and Bevel the Edges, instead of using the Subsurf.
Probably not the answer you’d like to hear…