Boolean Difference gives strange result

R023.2 - Bombe Ring Less Weight.3dm (1.3 MB)

I’m trying a fairly straightforward boolean difference from a ring and a cutter. However, it gives a strange result. I’ve attached the file. Any ideas to solve this problem?

this is a vertical section through the bottom end of your cutter

I deleted this bottom section and used Sweep2 to create a new cutter. It is an open surface and it works fine like this.

Check the file attached, I included the curves. Had to flip the surface for the boolean operation.

R023.2 - Bombe Ring Less Weight.3dm (812.1 KB)

Ok, thank you!

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Oh and when I swept the cutter I used the option to refit the section curves. Your initial surface was way over defined