[ ] Verify supply voltage selection before powering on.
[ ] Confirm no exposed conductors or loose strands.
[ ] Power on with hands clear of moving parts.
[ ] Verify display/controller startup.
[ ] Test each fan and motor separately.
[ ] Verify temperature readings are plausible at room temperature.
[ ] Test endstops/probe before homing.
[ ] Keep an emergency power disconnect accessible.
Safety: Disconnect mains power before electrical work. If mains wiring, grounding, or supply voltage is uncertain, have a qualified person inspect it.