It is a YAML file describing your hardware. You define the axes (x, y, and the two extra — FluidNC lets you map additional motors), each with its `steps_per_mm`, `max_rate`, `acceleration`, motor `step`/`direction`/`disable` pins, and homing. You add a spindle entry (relay or PWM) to drive the hot wire via M3/M5 and an S value for heat. If you use TMC2209 you add a `tmc_2209:` block per motor with `run_amps`, `microsteps`, UART address and stealthchop.
Start from a FluidNC example close to your board, change pins to match your wiring, set steps/mm, and test one axis at a time. Because it is just a config file, you iterate by editing and re-uploading — no recompiling.
Start from a FluidNC example close to your board, change pins to match your wiring, set steps/mm, and test one axis at a time. Because it is just a config file, you iterate by editing and re-uploading — no recompiling.