Above is a folding stove design that is constructed of bicycle spokes. This is similar to a two-wire stand with three legs that I saw on the web. I did not like the two-wire design because it looked unstable. This is a case where 3 is better than 4 or 2.  If you use 4 legs the square shape can allow opposite corners to move in/out from the center. Using three legs prevents this.

I used a #12-10 electrical wire butt splice slightly flattened and with the center detent removed.  Any pipe that two spokes fit tightly in will work.