Hi Michael,

Thank you for you answer

I export the 3 solids and attached them to this message.
Anyway you already have explained to me why this may happen, which was what I wanted to know, not to solve this particular situation.
If you can easily see what is the problem in this solids, I will appreciate it, but please don't spend a lot of time in this, it don't worse it.

Thanks you very much and good luck with V4

Eugenio