Do your PID Tuning
PID Tuning might be the most overlooked calibration that very few people talk about and yet it is the most important as it calibrates the heart of the 3D printer, your hotend. Why does my printer only print PLA above 230, why does random layer gaps form at any time of a print, why does my hotend temperature fluctuate during a print? All these are indications that your PID needs tuning. Here is an incredibly helpfull video to assist you in doing your PID calibration in minutes.