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Fig. 16


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Two tracks with three layers, both printed at 210 °C. a: This track was produced without an interrupt and retract and there are no surface defects. b: This track was produced with an interrupt and retract. The nozzle remained at the beginning of the track for the interrupt and the retract, which is why there was a small accumulation of material. Deepenings in the surface can be seen along the direction of extrusion.

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