1) Popcorn sound: popping sound during printing, material bursting inside the nozzle
2) Increased wire drawing: Abnormal fluidity of molten materials, resulting in wire drawing during empty displacement
3) Interlayer bonding decreases: Z-axis strength decreases
4) Decreased mechanical properties: decreased tensile strength and elongation at break
5) Increased size error: Material expansion causes fluctuations in wire diameter, affecting extrusion accuracy