Two approaches:
1. **Open-loop**: pick a PWM duty cycle, cut foam, adjust until the cut looks right. Simple, no extra hardware. What 90% of hobby cutters do.
2. **Closed-loop**: INA226 current sense module reads wire current. PID loop adjusts PWM to hold a target current (which correlates with temperature for a given wire). More elegant, ~€5 of hardware. The FluidNC YAML for this is on the hardware page eventually.
For reference: 0.3mm Kanthal A1 reaches ~280°C (visible dull glow in a dark room) at ~1.8A. EPS melts at ~80°C so you have huge margin.
1. **Open-loop**: pick a PWM duty cycle, cut foam, adjust until the cut looks right. Simple, no extra hardware. What 90% of hobby cutters do.
2. **Closed-loop**: INA226 current sense module reads wire current. PID loop adjusts PWM to hold a target current (which correlates with temperature for a given wire). More elegant, ~€5 of hardware. The FluidNC YAML for this is on the hardware page eventually.
For reference: 0.3mm Kanthal A1 reaches ~280°C (visible dull glow in a dark room) at ~1.8A. EPS melts at ~80°C so you have huge margin.