Most likely causestemperature, retraction, travel speed, and filament dryness.
Printer focusFlashforge printers are common in schools, shops, and beginner setups where slicer defaults may need practical adjustment.
Slicer checkReview Orca Slicer, Cura, Bambu Studio, PrusaSlicer, or the slicer profile used for this printer before changing mechanical parts.