Blender Asked by theDaviator on November 30, 2021
I use Blender to create 3D models for printing. Occasionally when I select mesh by trait – interior faces, the results shows some exterior faces selected.
I tried to use Mesh > Normals > Flip to fix this but nothing happens. Same for recalculate exterior faces.
I’ve also tried the 3D model plugin to “Make Manifold” but it removes the selected faces.
The solid model looks correct but will not print correctly.
Is there a way to fix this?
When you have trouble with Normals, i would highly recommend the following.
Now the entire object should be blue and you can deactivate the "Face Orientation" A little tip, add Flip and show Face Orientation to Quick Favorits per RMB It's so helpfull to have at hand and saves a lot of time.
Important is that only selected faces will be affected by the normal operations.
Interior faces as the tooltip says are faces were all edges have more then 2 face users!
Means faces that cover holes where more geometry is hidden behind.
Here a little visual explanation about it:
It's obvious that there are faces hidden behind the middle one covering a hole. I believe you may have generated overlapping faces that lie above/in front of others that are facing outwards. Try saving the file incremental and then select those interior faces and hide them with H. Should those now hidden faces not affect the mesh, just press Alt+H to show them again and delete them with X, "Faces".
Answered by Xylvier on November 30, 2021
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