I feel like the noob that is writing too much, just starting in knives specifically, but have just gone through all types of diy forges and what worked was getting 8 firebricks 2$ a piece at a place called camoose masonry. The coffee can was a HUGE waste of time for me personally and see a lot of people have trouble with them. Too messy, finicky, not so durable, etc. I used a masonry diamond cut off little less the 1/4" thick and carved a half circle tube/turbine shape out of one side of two bricks. You can really control the shape of the firing chamber this way. Drill a hole to fit your burner at the top edge of one side, put the halves together, two bricks on the bottom laterally (looking down facing the insert port) then your burn bricks centered vertically, one on either side, the one with the burner port you can cut the area out and then two more lateral bricks on top. So a two brick forge with one brick around all sides. You can control all aspects of how it burns and how much room you have just by touching that grinder to the brick little more here or there. The diamond wheel was 12$, bricks 17$ and the furnace mortar I may or may not glue it seal it with was 8$?, so 40$ all together. This thing works, and for the free coffee can, besides the mortar your supposed to wall it with, I would have spent another 40$ to have gone with the bricks first. I didnt cause I thought theyd be harder to find then they were and at first they were but there are a half dozen places to check out and 3 of them had them in my area, one sold out, one was closed which ended up perfect because the place I found was half the price. Keep up the good work everybody and with as little experience as I have I can say that a forge is made of bricks, nothing else. Other people might have gotten cans and other stuff to work and maybe even well, but if your looking to make your own forge I hope youll skip the messy, temperamental, possibly dangerous, trouble and just get the bricks. Happy forging!