Hello guys first thing i am really sorry for bothering i am sure you answer this question to many time so I apologise.
i just need to know how can Filet this object. Thank you

Hi albehany, you would probably need to put a small fillet on the box edges first before doing the boolean:



That will then make a fillet like this possible:



With sharp corners and very pointy sharp corner MoI's filleter is not able to handle the juncture between fillet pieces in your original configuration.

- Michael

Thank you so much Michael, this is really great.