Most likely causestemperature, retraction, travel speed, and filament dryness.
Printer focusBambu Lab printers are fast, enclosed or semi-enclosed depending on model, and commonly tuned through Bambu Studio or Orca Slicer.
Slicer checkReview Orca Slicer, Cura, Bambu Studio, PrusaSlicer, or the slicer profile used for this printer before changing mechanical parts.