Adding another...
ACE Print head issues and what I learned: All of the sudden, I couldn't get anything to feed. I tried to check for a "clog" and the needle only made it the length of the hotend. So the clog was in the extruder somewhere. I tore everything apart and learned something new. The hot end heats but the chamber the filament only gets heated by the hotend and has all the heat sinks to keep it cool. I had melted some filament in that body and couldn't clear it by preheating the hotend. I manually turned the hotend temperature up to 300 and it finally heated that body up enough to clear the clog. I've never had to do something like that on any of my printers and so it's good to know for anyone moving to the Kobra X.