I don't know what material it was, but a short TV insert showed a 3D printer "copying" a wrench. It was usable, so not a basic plastic.
While there's a lot of information around on the subject, I don't like to leave a question unanswered. So, it's both, and the thickness of the wick as well. Different thicknesses of resistance wire will have different resistance per inch, so the overall resistance is determined by the actual length of the wire. Best to use a multimeter to get precisely the resistance you want.
The first chart here had it the wrong way around. A thicker wire will have a smaller resistance, so it would need more length.
I agree with the general point of your replies but to be clear please keep in mind that 32 gauge wire is thinner than 30 gauge wire, so the thicker the physical wire (of equal material) is the lower the resistance is. But a wire with a higher gauge is thinner than a wire with a lower gauge thus higher gauge wire has greater resistance than lower gauge wire. The chart is correct.
Also the wick will not affect the resistance. Fiberglass (silica, ceramic, whatever) wicks are non-conductive so they will not affect resistance and SS mesh wicks can only work in this application if they are oxidized first so that the coil never makes electrical contact with the SS wick and thus will not affect resistance.
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