In general, try to avoid booleans ! They're not stable, they leave unused vertices everywhere ... Most of the times, there is a modelling technique that would give the same result, but better . Sometimes, there isn't . So RLG1034, if you'd show us what you are trying to achieve, maybe we could think of a modelling workaround if it exists . Boolean ops are like cheddar . Cheddar looks like cheese but ain't cheese, while Boolean ops look like modelling but ain't modelling ! ;) litst