Stacker Ring for 796 ml Cans. The Habitant soup cans and Diced tomato cans in my area are 796ml (about 100mm diameter/4") and don't have a metal "lip" that allows cans to stack. So I made this ridiculously simple ring that sits between the cans and keep them aligned, instead of falling down. The rings could be a smidge tighter, but they do the job. I've included the step file and the original FreeCad file I made, if you need to modify.