I am trying to use the variable radius feature, but I can't use large radii, I used the proportions of the instruction movie above, but it fails. what am I doing wrong?

Hi wim, you didn't do anything wrong, it's just a bug in filleting where it's having a problem in the step where it tries to trim away the area of the main object to make a place to attach the fillet. When that happens the fillet surface will still be generated so you have something to work with and you can use Edit > Separate on your main object to break it into individual surfaces and then use Edit > Trim on each surrounding surface to cut it with the edge of the fillet to finish the model.

- Michael

OK. it works till a certain extent, I am afraid.
I'll wait for the bug fix ;-)

cheers
wim