Table 2.

Effect of the layer thickness on the mechanical properties.

Source	Material	Type of the Test	Remarks
Jatti et al. (2019) [60]	PLA	Tensile and flexural strengths, Impact resistance	Increasing infill density increases tensile and flexural strengths of the specimens, due to more material resists the force.
Alafaghani et al. (2017) [64]	PLA	Tensile strength, yield strength, Young’s modulus	Increasing LT increases mechanical properties.
Huynh et al. (2019) [86]	PLA	Tensile strength	Decreasing layer height will increase the strength of the part. Layer thickness is the rank 2 parameter
Sharma et al. (2019) [83]	ABS	Compressive and tensile strength	Increasing the LT decreases the tensile strength, while increases compressive Strength.
Samykano et al. (2019) [75]	ABS	Tensile strength	Layer thickness has no effect and was not a statistically significant parameter
Coogan et al. (2016) [25]	ABS	Tensile strength of the bonds	Layer thickness is the most significant parameter affecting bond strength
Randriguez-Panes et al. (2018) [61]	ABS and PLA	Tensile strength	In the case of PLA, lower layer thickness was desired as it produces the highest strength. In the case of ABS, LT was not significant.