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Scanning Electron Microscopy image of a control sample printed in vertical orientation (sample #18): (a–c) Upon rupture, the sample presented uniform fracture lines along the deposited horizontal layers, showing poor adhesion at the layer level; (d–f) Internal gaps between deposited filaments remained embedded in the part, weakening the structure; (g–i) Bigger internal voids remained embedded in the part in the area where the raster angle changes from one layer to another.
