Hi yophie, yes like Brian says above if you manage to get one good section, you can possibly use Transform > Array > Circular to replicate it around and then join the pieces together.

If you're still having problems, if you can please post the 3DM model file of your object before you tried the boolean on it, that would then make it a lot easier to zoom in and see what's going on and give some better feedback.

Also which version of MoI are you using? There have been some tune-ups to some of these kinds of "coming to a single crown point" type intersection calculations in MoI version 3.

- Michael