Treat the wire like a spindle. The simplest is a relay or MOSFET switched by the controller's spindle-enable output, turned on/off with M3/M5 (or M8/M9 in some setups). For adjustable heat, drive a MOSFET with a PWM signal so the spindle-speed value (S word) sets duty cycle = wire temperature, configurable in FluidNC.
Keep the wire's high-current supply separate from the electronics and switch only the low-current gate from the controller; tie grounds at one point. https://cncfoam.com emits the wire-on/off and a pre-heat dwell automatically, so the machine warms the wire, cuts, then shuts heat off at the end. Never switch mains-level voltage from a logic pin.
Keep the wire's high-current supply separate from the electronics and switch only the low-current gate from the controller; tie grounds at one point. https://cncfoam.com emits the wire-on/off and a pre-heat dwell automatically, so the machine warms the wire, cuts, then shuts heat off at the end. Never switch mains-level voltage from a logic pin.