Andrew says you can cut the cans with a knife as well, but the cutters will help you save a considerable amount of time, especially if you want to make several stoves. Follow the video to see Andrew cut out the various parts from the two cans and then use a file to add creases to the inside wall of the stove.
He then drilled 1/32” holes in the top ring of the stove. The holes define the size of the flame, so you can use larger drill bits for a bigger flame. He finally tapes the parts together using some metal tape to create a leak-proof seal.
