Eco-friendly materials are increasingly being researched as replacements for synthetic materials. Agrowaste-based materials are considered for the development of natural fibre reinforcement (NFR) composites in the current work that will assist in the circular economy. Moreover, recent advances in three-dimensional (3D) printing technology have led to further development of NFR polymer composites. Most 3D-printed NFR polymer composites are produced from filaments mixed with poly lactic acid (PLA) pellets and fine natural fibres. A new method is attempted to effectively utilise the directional properties of natural fibres in composites. Among the natural fibres, coir fibre is selected because of its good ductility, abundance and cost-effectiveness in a tropical country, India. In this work, long coir fibres are oriented in the desired direction in the PLA matrix during 3D printing process and its effect on tensile and flexural properties is investigated. Tensile and flexural test specimens containing coir fibres were successfully fabricated by a 3D printer using commercial PLA filament. The incorporation of long fibres is found to significantly improve the flexural strength and looks promising for further research. The failure mechanisms are discussed based on the observation of the fractured samples.