Just finnished my K40/Smoothieboard mod. Everything seems to work now. Made custom adapter board to connect all K40 wires to the Smoothieboard with existing connectors. Laser is fired through the power plug of the K40 that has a laser pin with it. K40 now has network and also WLAN via WLAN-SDCard.
https://www.youtube.com/watch?v=nLQzIL42OtA
Nice track choice. Wasn’t expecting that 