Table 3.

Process parameters.

Printing Parameter	Depiction	Description	Impact on dimensional accuracy identified in analysed studies from an increase (↑ top row) or decrease (↓ bottom row) in printing parameter value.
Extruder temperature (ET)		The set temperature that melts the material so that it transitions from its solid state to a semi molten state for deposition. ET can also influence the defects listed: Circularity, Geometrical accuracy, Porosity, Surface Roughness, Stringing, and Warping.	↑	[28, 37, 67, 73, 77, 88, 105, 114, 118, 123, 125, 126, 127]
			↓	[34, 36, 38, 43, 54, 68, 83, 90, 92, 93, 95, 102, 108, 111, 112, 115, 116, 117, 128]
Nozzle diameter (ND)		The fixed diameter of the nozzle orifice, where the filament is extruded. This directly affects the road width. ND can also influence the defects listed: Geometrical accuracy and Surface Roughness.	↑	[6, 63]
			↓	[64, 112]
Bed temperature (BT)		The set temperature of the build envelope that enables adhesion between the material and substrate. BT can also influence the defects listed: Circularity, Geometrical accuracy, Shrinking, Surface Roughness, and Warping.	↑	[37, 114],
			↓	[54, 68]