This study aims to fabricate Polylactic acid/Graphene/Clay (PLA/GPN/Clay) composite using the fused deposition modeling (FDM) process and simultaneously improve the yield and impact strength. Hence, Taguchi method and grey relational grade analysis are used to attain the optimal values of GPN content, clay content, print speed and nozzle temperature. SEM, TGA and DSC tests are used to analyze the fabricated samples. The results indicated that the addition of GPN and clay in the PLA led to an enhancement of the thermal stability of PLA/GPN/Clay composite. Taguchi method results also demonstrated that the impact of graphene content and nozzle temperature on the yield and impact strength is more than the other parameters. The grey relational grade analysis also indicated that the impact and yield strength of PLA/GPN/Clay composite were enhanced with a 2 wt% clay content, a 1 wt% graphene content, a 30 mm/s print speed and a 215°C nozzle temperature.
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