Shell help

 From:  Michael Gibson
3965.12 In reply to 3965.10 
Hi Alexander, so one problem I see right off the bat with your model is that it is not a fully closed solid - it has some unjoined edges in it.

I can tell this because when I select it, the type indicator in the upper-right area of the window says it is a "Joined srf" , if it was a totally closed solid it would read "solid" there instead:

So that's one indicator that the model is not cleanly constructed - it's got some pieces that are not joined up properly.

- Michael