In my how-to quest for the best DIY rocket stove, I make a big cobb and fire brick rocket furnace.
Check out my flat-pack camping rocket stove on Amazon:

My goal for this furnace is to melt aluminum cans using a graphite crucible. I love rocket stoves (of various kinds) because they use found-fuel, sticks and twigs, a sustainable and renewable bio-mass fuel source, which is also carbon neutral.

For this rocket stove, which I am calling a furnace or forge (also MAX), I’ve used a cobb chimney contained inside a 13 x 13 inch flue pipe. The flue pipe protects the cobb from eroding and the cobb insulates the flue pipe from high temperatures. The chimney sits on top of a fire brick fire box with a paver surround.

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