I've been reading around a bit and now it's time for my own post. I thought I'd ask about this to make sure it is reasonable. I'm thinking about making some sort of power switch that is controlled by some sort of logic reading from the printer. Something like an arduino reading the temp on the hot end and powering down the printer when the temp change is -180c (230 to 50 during the cooling after the print) or something like that. Is that reasonable or just too much? I don't much mind the ramps and mega being on. It's really just the fan that annoys me. I have a hexagon that requires the fan to be on during all printing. Maybe I can just install a normal power switch and then find a way to shut down the fan at that temp since it's probably more doable in marlin than the other option. What do you guys think?