need to switch a relay after print is ready / how to do

[ICY_SNAKE]

I need some information.

After the print is ready i need to switch a relay. (the relay will turn off my extra fans, lights etc)

Can some one explain me how to do that.

Many thx
Dieter

[T3P3Tony]

@icy_snake you can put the command in your end gcode so once the print is finished it will run. As to how you control a relay that depends on the Duet you are using but here is a place to start:
https://docs.duet3d.com/en/User_manual/Connecting_hardware/IO_GPIO