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To make the top and bottom of our can, we used a 3-inch hole saw to cut sections from the sheet of 6061 we bought with the tubing. We drilled out whole circle sections for the top and bottom of the can. The semicircular pieces we cut on the edges will be used as baffles inside the can. Though aluminum is easier to cut than steel, we sprayed the blade with some penetrating oil to keep the saw from overheating.