Non-Manifold after boolean modifier (difference).... Why? I've made a simply (big) knob for potentiometer. After applying boolean modifier (difference) for create a starred hole (starting from a starred cilynder), the object come with &quot;Non-Manifold&quot;... Why? Anyone can help me? Thamks in advice.
It looks like the cut has its normals inside out. In edit mode select everything with A. Then recalculate the normals using Shift+N. If that doesn't work make sure that your cutting object is manifold before cutting.