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Scanning Electron Microscopy image of a sample printed in vertical orientation (sample #09): (a–c) Unlike the control sample, the linear voids between deposited filaments have been filled during the heat treatment; (d–f) Upon rupture, the sample presented fracture lines along multiple horizontal layers, indicating superior layer adhesion; (g–i) Spherical pockets of air 10–70 µm in diameter remain inside the part.
