You could just cut the can down a little and leave the arch out.
I removed my chimney and cut the arch and it fit perfectly. It needs to be about a quarter inch below the top of the rim of the No.10 can for proper use. I do not have a picture of this, but when I first put it all together I noticed that the chimney stuck up too high for placing anything on top. Otherwise the chimney will be too tall when finished. I also would recommend cutting a small arch into this can where it intersects soup can #2 coming in from the side. Seemed like a lot to take off just to squeeze down inside the circle of the other soup can, but it did. I found that I needed to slice off about a quarter of an inch worth of excess can in order to crimp it down small enough to neatly fit inside of soup can #1. You will fit this as the chimney stack, inserting it into soup can #1 that is sitting inside the No.10 can.
Take your third soup can (soup can #3) and remove the top and bottom and then slit it vertically from top to bottom. I cut the shape and then rounded the edges back a bit for a snug fit. I punched a starter hole with the hammer and nail again. Pull the soup can out of the No.10 can and cut out the shape drawn on it. you don't want any big gaps, but you also don't want to trace a hole onto the soup can that is already to small to fit the next soup can you will be inserting into it.
#Building a rocket stove pro#
Pro tip: Make sure you have fitted a can through the No.10 can hole to make sure it fits through cleanly but somewhat snug. The photo is hard to make out but it is a picture of the soup can inside the No.10 can with a faint black marker outline of the hole on the soup can. I then took a Sharpie pen and traced the hole I had already cut in the No.10 can onto the soup can. To do this, I placed my first soup can into the No.10 can and snugged it up next to the hole I had cut in the No.10 can. You are going to need to have a hole cut at the same height in soup can #1 so that a later soup can (soup can #2) will go through the No.10 can and directly into soup can #1 to form an elbow of sorts. I was afraid of cutting too big to begin with and therefor spent a considerable amount of time fidgeting with it. Later can fittings were made easier by just cutting the hole to the right size to begin with. I was somewhat conservative when cutting and widening the hole took some effort. I used a pair of needle nose pliers to bend the edges of the hole back to get the final shape, but in retrospect I would have probably just relied on the sharpie outline and cut the hole wider to begin with. The tin snips cut through the can quite easily. Punching that many holes turned out to be a waste of time as a single hole would have been fine. I then punched a number of holes into the circle so I could get the tin snips in there to cut the circle out. I cut my hole slightly above the bottom of the can to make it easier to avoid dealing with the bottom of the can when cutting and shaping the hole. Take one of the four soup cans (soup can #1) and trace the shape onto No.10 can.
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