I would like to add a 3D border to all edges of a mesh, such that the border is a "cylinder" that wraps around the mesh. The effect would look something like this:
My object is very similar to the white-textured part of the above image, it is a fully 2D mesh. However, differently to this mesh, the object is entirely one face, so I just need this effect applied to all edges of the mesh, and there's no edges in the middle that could get in the way.