"you could use the following method, if you still need to have it converted..

# select and join the inner surfaces.

# copy this new surface and give it a good shelling (2 units / normal). exports fine now.."


Marco,

Thank you, Thank you...

I tried what you suggested, or should I say taught me! I was unfamiliar with this type of usage for the separate tool. Very nice now, no more program hanging for two minutes during an export before this portion of the mesh disappears...

David