Three-dimensional (3D) printing technologies have drawn extensive interest in both academia and industry for their ability to fabricate functional and complex geometry components. Unlike injection molding or other processing methods, 3D printing can directly produce highly complex designs or prototypes containing moving parts without the need for molding or machining in a timely manner. Fused filament fabrication is one of the most used 3D printing techniques due to its versatility and ability to combine polymer with organic or inorganic fillers. New feedstock materials can be derived from plastic waste as a means to address the urgent environmental concerns from these materials. In the present research, recycled materials recovered from the ocean and agroindustry waste product (soy hull) were transformed through twin extrusion process to obtain filaments for 3D printing. Filaments were a combination of polyethylene and polypropylene as well as soy hull to make 3D printed products and their thermomechanical, rheological properties were studied. 3D printing parameters were optimized to achieve the complete, warpage-free printing samples without defects and enhanced performances. Combining recycled plastic from the ocean and agroindustry waste generated value-added products from the use renewable sources while contributing to the circular economy approach for sustainable product development. Acknowledgements: The authors are thankful to: (i) Ontario Ministry of Economic Development, Job Creation and Trade ORF-RE 09-078 (Project #053970); (ii) the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA), University of Guelph, Bioeconomy Industrial Uses Research Program Theme Project #030252; and the (iii) Natural Sciences and Engineering Research Council (NSERC) Canada Discovery Grants Project #400320 for their financial support.