Probably the best bet would be to scale the ring pieces slightly up or down so that they will have a simpler and cleaner intersection with the main piece without any sliver thin pieces getting created.

- Michael

Hi Koi, here's a version with those pieces booleaned in now. I scaled the rings slightly so they had a better intersection with the surrounding geometry.

3DM file attached.

- Michael

Hey Michael,
I understand... Thank you so much!! Also for sending me the right object :)

Thank you again and have a nice day!

Koi