Gotcha, thank you very much Michael.
When you have a chance, I'd be interested to know what causes this issue - no rush.

Much appreciated

Hi Michael,

Just to let you know that there's no issues in Moi v3

John

Hey John,

Would you mind telling me how you got this to work?

Many thanks,
Gunter

Thanks Michael, I did that and it worked!
Much appreciated!
Gunter

HI Gunter,

As I said, I tried your file in Moi version 3 and the boolean works as expected.
I have version 3 and 4 installed on my system.

Best regards

Hi Gunter

part of your issues are the profile you are sweeping is folding on itself in the centre at the bottom
Then when you boolean out the band it self destructs







If you change your sweep profile so does a clean sweep it will work
I have done you an alternative sweep profile to aid in setting the stone

cheers
shayne