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I was trying to model my object for 3d-printing and faced this problem. I use 3D Printing Toolbox in Blender v2.79. And checking my object for manifoldness, it shows me that I have Bad Contiguous Edges. I don't know what to do with it. enter image description here On this picture, that edges are selected. And 28 Non Manifold Edges are because I haven't used Mirroring yet.

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In Edit mode, I pressed A to select all, then Mesh->Normals->Recalculate Inside. This fixed it for me as my problematic edges were inside a cylinder recess in my object.

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Select the face, then in Face Menu / Face Data, click "Reverse UV". That generally happens when a face is made on the wrong side.

Additionally, you will need to use "Mesh / Normals / Recalculate Outside". Seen that with parts of bottom faces detected as top in STL exports (bad color seen in Cura for the example)

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Just re-calculate normals(Ctrl+n with everything selected in edit mode). That fixed it for me.

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    $\begingroup$ Hi. Would be helpful if you could add instruction as to how the user should recalculate normals. $\endgroup$ – Ray Mairlot Nov 14 '18 at 16:32

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