Hello Michael,

Thanks for your reply. I think I understand your method but will try later today to see it for myself.

Originally the outer shell of my inhaler was closed. However, after the sinusoidal cut and bevel (rounding) I deleted the side surfaces were the inner part of the inhaler is located. Perhaps the boolean method would have worked if I had applied it earlier in my modelling process. I will try to remember to do booleans preferably with closed surfaces.

I can imagine that the double surfaces were created in the modelling process as sometimes I did not understand exactly what happened during a trim or boolean.

Yours sincerely,

Ray Deleu.

I added two renders of objects created with MoI, rendered with C4D 6+.