Here is a quick fire pit ring I made from scrap sheet metal.
The pieces were cut with my CNC Construction Set plasma cutter.
See the write-up here:
No Weld Fire pit — Kronos Robotics
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Author of: The CNC Construction Set Books, the KRMx01, KRMx02, KRmc01, and KRmf70 CNC Books, the HANS Electric gear clock book. All available at www.kronosrobotics.com.