Here you go!
In a nutshell, it’s connected to the hot end fan connection on the board. When we hit the go button, the board thinks it’s 3d printing, so it fires up the hot end fan. When the relay senses power on the input wire it flips the switch for the devices on the power strip. When the power goes away, it turns them off. So basically I just have to make sure the power switch on the router and vac are in the on position before I hit go. I’ve heard of a hack to make all four ports controlled by the internal relay, but haven’t bothered with that yet.