Prusa XL Noise Due to Linear Rail Friction

To diagnose this cause, power off the printer and manually move the toolhead along the X and Y axes. If you feel physical "notches," resistance, or hear grinding, the linear rail motion system is compromised. Inspect the rails for visible debris, dust buildup, or signs of dry bearings. The absence of adequate lubrication on the MGN rails will result in audible friction during movement.