Best practices for booleans

For best results using booleans:

• all objects should be manifold meshes
  NoteNon-manifold meshes are only supported if the non-manifold components are not at the intersection of the boolean operation.
• face normals should be uniform across all surfaces
  TipBefore performing your boolean operation, view the normals on your mesh (Display > Polygons > Face Normals). If the normals are not uniform, the boolean operation will not produce predictable results. See Normals > Conform.

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