How do I keep the wire from sagging when it heats up?

Question

Heat makes the wire expand and lengthen, so a fixed-length wire goes slack and sags the instant you power it. The fix is a **spring tensioner**: anchor one end and run the other through a spring (extension or constant-force) that pulls the wire taut and automatically takes up the thermal expansion as it heats.

Tension it hard while cold so that even hot it stays straight, and use a wire that holds tension well (stainless is stiff; nichrome is fine with enough spring). On long spans, more tension and a stiffer spring help. Always heat the wire after tensioning, never before, and re-check tension if you swap wire length or gauge.

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