u/WeakLingonberry3709

Hello, I 3D printed some things at school and then decided to get a 3D printer for myself and I built it. I went through all the calibrations including PID (not really sure what it is) but I did all of the avalable calibration options on the machine. Then I made a benchy, it was bad but I just had to tighten a belt. Then I did another and it was perfect, but whenever it is cleaning the nozzle/calibrating, it scrapes the nozzle on one spot on the heatbed. The prints are perfect though. How can I fix this?