I made a nice looking alcohol stove out of two pop cans, it has inner wall with holes around top edge to allow gasses to burn through, it work great looks like a gas stove top when the flames incircle top of can. My issue was I couldn't get it to ever get 1 3/4 cups of water to ever get to fast boil, and it took about 10-12 minutes to get little bubbles. I didn't know if I was doing something wrong or if my aluminum pot from REI is hurting results. I really think my stove is built correctly, but results don't look like youtube results?