Adhesively bonded joints play a vital role in improving the structural perfor-mance of 3D-printed components. This research aims to examine the effect ofgraphene inclusion on the failure load and vibrational behavior of polylacticacid flat-joggle-flat (FJF) joints prepared using fused deposition modeling. Thepresent research focused on the effect of print directions (0 degrees,45 degrees,90 degrees) and theinclusion of graphene nanofiller (0.25, 0.50, 0.75, and 1.00 wt%) on the perfor-mance of FJF joints. The effect of raster direction on mechanical propertieswas examined by tensile testing of dog-bone samples. Results showed that 0 degrees print orientation had higher tensile strength compared to other printing direc-tions. Shear testing of FJF joints indicated that the inclusion of graphene hasenhanced the strength of 3D-printed FJF joints by 61.18%. Fractography resultsshowed that the formation of the shear band with the inclusion of 0.50 wt%graphene helps to distribute the stress more evenly and prevent catastrophicfailure of the FJF joint. The free vibrational test revealed that the inclusionof 0.50 wt% graphene had improved the natural frequencies, as the presenceof graphene-enhanced the interfacial bonding between FJF adherend andadhesive. Highlights center dot 0 degrees print orientation had higher tensile strength than other printing directions.center dot Inclusion of graphene-enhanced the shear strength of flat-joggle-flat (FJF)joints by 61.18%. center dot Shear band formation delayed the failure of graphene-reinforced FJF joints. center dot FJF reinforced with 0.50 wt% graphene had adherend failure. center dot FJF joint added with 1.0 wt% graphene had lower natural frequencies.