I have a part that is similar to a flat plate that is 5 mm thick. I need to round off the top edge so it blends into the lower edge. On a kitchen counter top this would be called a "“demi-bullnose” edge. But I can’t figure out how this might be done. Any ideas?
You could do it several ways. An easy way is to draw a profile of the disk with the round over and run Follow Me around a circle. Depending on the radius of the circle, you might need to scale the geometry up before running Follow Me, though.