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Blender 2.8
fix boolean operations
Sometimes boolean difference fails. Before try on each object:
- edit mode
- select all vertices A
- vertex (top menu) → Merge Vertices → by distance (this operation remove duplicate vertices)
hide / show
- select (multiple) object and SHIFT+H to hide others
- recall others with ALT+H
edit mode
TAB key
- activate Vertex select with 1, Edge select with 2 and Face select with 3