Hi Michael,

"...It's possible that just the scaling down alone would do it, maybe the trimming was not needed after all."

You're right ! (obviously.....)

I tried your suggestion and it works :
1) scale all to 0.1
2) create the G2 blend
3) join all and...

voila ! The piece is a solid!

The last part of your answer remain obscure for me...
"Another thing I've thought about trying is to extend the blend surfaces sideways and then I might be able to intersect them better with each other."

I tried to do a "scale 1D" on each single blended surface, but i think i misunderstood your thought.

But now it's not so important.

Thank you very much !

Marco.