I had a go at setting a full ET ring today I cast it at 1.5mm and used 1.4mm stones the extra 0.1 was lost through polishing.I worked out the stone placement in CAD and printed and cast it. the sprues look like a wheel because I couldnt attach them on the outside because of the markings for the stone positions.





the sprue was removed





then I went through the grades of sandpaper to clean it up










I then put 3 stones on top of the indents to check I had the correct spacing.