Have you ever gone through your entire calibration of your machine, only to shut it down for the day and have everything messed up when you start it up the next day? Have you ever leveled your bed, only to run a test part and find that everything comes out as a goopy mess? I spent a very long and frustrating weekend doing exactly this.

I would calibrate it and think “ok, now I’ve got it.” Nope, now I’ve got heat creep. Swap out the nozzle. Ok, now I’ve got it. Nope, now my extruder is underextruding. WHAT IS GOING ON?

When you have this, check your connections. In my case, the connector for my part cooling fan was loose and the fan wouldn’t always run. The results of not having a part fan can cause heat creep and poor adhesion. My filament wasn’t being cooled and so it would just get pushed around by the next layer that was supposed to adhere to it.