Before I start, this printer is a school printer owned by my computers teacher. I unboxed it, set it up and got it running, and have been troubleshooting it over the past few months. Most hiccups I have been able to sort through in the short amount of time I have to tinker with it. But after the last one, a clogged hot end, it started back up fine, and when I went to print, MatterControl showed the extruder and bed heating up, once it gets to 235 (I print in ABS.) it immediately starts going down in temperature before it prints. I made sure the thermometer and heating element were put back into the hot end when I screwed everything back together. It is definitely heating up, but I am unsure as to why it cools down before it prints, and only then. Any help would be greatly appreciated.