it must be something at my side, I tried with your file Michael, and it works splendidly. but if I generate my own perfectly circular shapes, it fails. I even simplified the shapes, I use quarter and half circular arcs only, but still get no further than .6 cm.

o, btw, I just discovered these answers now and by accident, the number after my title in the left column of the forum in my browser (firefox) still said [1], which made me think that there were no answers yet. I opened my thread by accident and saw all these entries. strange...