Morality : Shell prefers to work on "closed volumes" :)

Very practical for make wallls of pieces some complicated :)
Just select some faces & voila :)

Hi Michael,

Very clear and useful information.
It's almost certain that I will come back on this subject later when I will want to give some thickness to more complex objects (what are then the best strategies for "preparing" the model...) but at least I know where to start now !

Many thanks

- Schbeurd