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(a) A PLA specimen molded at 24-300-1.2 condition (please refer to the original text for detailed explanation) without any physical defects [115]; (b) Sprue with numerous holes from 50 μm to 1 mm; (c) Molten material remained adhered to the sonotrode sufface [112]; (d) Highly degraded sample with very low tensile strength [113].
