Smelting Furnace Torch
grabcad
The absolutely least efficient way to heat something up. Hook up an LPG tank and watch it empty in moments whilst you terrify friends and neighbors with dragonfire. I modeled it the way I built it years ago, before I knew anything about smelting. Or thermodynamics. Or anything else for that matter. Whatever. It does work. The fitting on the back is printed in PETG and holds a generic vacuum motor. Additional video: https://youtu.be/pQZ2EC8VMCc
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