Raster angle mechanics in fused deposition modelling

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Materials Testing Standards for Additive Manufacturing of Polymer Materials: State of the Art and Standards Applicability (2015, methodology): “The impact of processing for anisotropic mechanical properties in material extrusion has been identified by multiple authors with ME processing of ABS polymers as a major focus [54, 57-68].”
An investigation into 3D printing of fibre reinforced thermoplastic composites (2018, background): “This allows for design tailoring, but stiffness can be 11% lower and tensile strength up to 50% lower in the weaker 1- and 3directions compared to the bulk properties, as the interface between printed tracks can be weak [11,12].”
Structure and mechanical behavior of Big Area Additive Manufacturing (BAAM) materials (2017, methodology): “[14,15] Figure 1 shows a polished cross section of acrylonitrile butadiene styrene (ABS) sample deposited with BAAM.”