Hi, I'm working setting up a standard Arduino relay (something like this: ) with my RAMPS 1.4 / Marlin firmware board. I have the relay module hooked to 5V, and the POWER_ON RAMPS pin, on the same line as the servo enable jumper. My relay is functional, and triggers fine using M80/M81. In Marlin's configuration.h, I have "PS_DEFAULT_OFF" enabled, so my relay pin will be pulled low(?) when the boby porksusanjoe - Repetier