The motivation for this work was to increase the economic life of recycled poly(lactic acid) (rPLA) (30 wt%) by utilizing it with virgin PLA (70 wt%) in the presence of a fiber-based reinforcing filler, micro-crystalline cellulose (MCC) and an epoxy-based chain extender. A conventional melt extrusion technique was used to fabricate the strands with and without MCC and chain extender in the PLA/rPLA blend matrix. It was observed that high melt flow index (MFI) of rPLA was reduced significantly after the addition of chain extender, which resolved the issue related to excessive polymer flow during processing and hence made it possible for use in fused deposition modeling (FDM)-based 3D printing. The printed specimens were used to analyze the challenges related to anisotropic behaviour and void formation of the blend formulation. The addition of chain extender improved impact strength of 3D printed PLA/rPLA specimens. The density of 3D printed PLA/rPLA specimens were lighter compared to their injection molded counterparts. The voids in 3D printed material contributed to the lighter nature of the developed sustainable composites. The modulus and tensile strength of 3D printed sustainable biocomposites were improved significantly whereas impact strength increased by ~10% by reinforcing the blended matrix with 5% of MCC. Acknowledgments This research was financially supported by the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA), University of Guelph, Bioeconomy Industrial Uses Research Program Theme Project #030252; the Ontario Research Fund - Research Excellence (ORF RE) 9 project from the Ontario Ministry of Economic Development, Job Creation and Trade Project # 053970; the Natural Sciences and Engineering Research Council (NSERC), Canada Discovery Grants Project #400320