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I have modelled this large building (see below). After joining all the elements of the building to one big mesh I separated a part of the building. In this building there are floors and these floors / planes are also separated now. But you see in the encircled area that somehow there are residues ( "borders" of those planes). What are those residues ? It looks like that these residues are the borders of those planes / floors ???

enter image description here

This is the blend file before separation

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OK, I think you were in face selection mode, and you have unconnected edges. That is what you are seeing now. Because the edges were not part of a face they will stay unselected when using face select mode.

PS You also have a LOT of duplicate vertices, 83,559 to be exact, Not related to this, but probably not going to help you.

To delete the unconnected edges, switch to edge select mode, and select one of the loose edges.
Then from the 3D view header Select > Select Similar > Amount of Faces Around an Edge, or just simply ShiftG then A. Now delete all the selected vertices with X > Vertices, or Delete > Vertices.

animated gif - showing the select similar operator

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  • $\begingroup$ I will try your solution but how are these residues created ? $\endgroup$
    – user13877
    Commented Jul 13, 2016 at 14:54
  • $\begingroup$ I dont know how you made the mesh, but probably at some point (maybe when you were making the window?) you just accidentally duplicated an edge. Then after applying all array and mirror modifiers, it adds up to a lot of duplicated edges. $\endgroup$
    – David
    Commented Jul 13, 2016 at 14:57
  • $\begingroup$ thanks. your solution works. !!! Also important that I know what was causing these problems $\endgroup$
    – user13877
    Commented Jul 13, 2016 at 14:59
  • $\begingroup$ maybe I am doing something wrong. When I do Shift G and delete the vertices also some holes in my mesh are created. So the residues are deleted but also some parts of the mesh that should be kept. $\endgroup$
    – user13877
    Commented Jul 13, 2016 at 16:10
  • $\begingroup$ do you know what I am doing wrong ? $\endgroup$
    – user13877
    Commented Jul 13, 2016 at 17:34

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