Hi,

thanks for your replies!

I'm sorry, I already deleted that testfile.

I now think, as you suggested, that the rotation of the spheres
caused that problem. I didn't care of the orientation/rotation
when I arred them along the path.
Will try that again.

And Michael, the main object was a "closed solid" !
This, by the way, was one of the most important tips
you gave me, that solved all of my previous "fillet"-problems.

So, little by little, I'm getting closer to all
the brillant modelling-possibilitys of MOI!

thanks
Mike