Hi Michael,

> the version you have here isn't a solid, it has some naked edges.

I already noticed that! if you take a look at the attached file you will see that I made the object using Shell operation I shelled a joined surface ( Shelling distance = 1) MOI did not give me a solid!

I know the joined surfaces are not matched well but it is created using sweep!

Edit: Sorry, I meant Blend I made the joined surface using Blend command! NOT Sweep.

Blend makes tiny extra edges I don't know why!

What did I do wrong?