Hello Michael,

Ok, it must not to use a trimmed surface, the solid/plane it's better. So, my base surface is a line circle fills by building function "Plane". I thought that was not a trimmed surface (a surface cutted, hewed).

If I draw a Solid/Cylinder & that I keep its base; this will be a solid circle or a trimmed surface?
If I see the points it's a solid surface, is that? If not, it's a trimmed surface.

Thank you, I go to test all that & read a lot of things about MoI.