The deposited filament, from which the 3d printed specimens are comprised (sometimes referred to as rasters, fibres, roads, tracks or extrudates in other studies). Extruded-filament geometry:The cross-sectional geometry of the extruded filament.EFW: Extruded-filament width F: Filament direction (sometimes referred to as longitudinal direction in other studies -parallel to the print bed)Interface: The region of joining between two extruded filaments. Interlayer bonding:The interfacial bonding between layers (extruded filaments). LH: Layer heightLoad-bearing area: The cross-sectional area of the specimen, which bears mechanical load. Specific load-bearing capacity:The maximum load capacity of specimens normalised by the weight of the unit length of the specimen gauge. Z: Z-direction (normal-to-filament direction and normal to the print bed).

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