The adoption of bio-based materials as sustainable alternatives to fossil-derived options is becoming increasingly vital across industries. This research focuses on the development and performance characterization of Cellulose Acetate (CA), reinforced with natural fibres. CA, derived from renewable resources, offers good mechanical properties and excellent aesthetic quality, positioning it as a promising alternative to traditional petroleum-based polymers. This study evaluates the influence of hemp natural fibres on CA composites. Special attention is given to the effect of these fibres on the overall performance of the compounds, including their aesthetic appeal, which is critical for consumer-facing applications. To enable sustainable, efficient, and scalable production, the research utilizes Fused Granulated Deposition (FGF) technology to produce the demonstrators. This AM process allows the use of granulated feedstocks, reducing material costs and waste. Nonetheless, challenges such as layer adhesion and warping of CA during processing are addressed through a comprehensive parameter optimization, ensuring dimensional accuracy and high-quality output. The developed CA composites have been successfully validated through prototypes for construction sector such as green-wall components. These prototypes exhibited improved mechanical performance, aesthetic finishes and durability. This work highlights a pathway for achieving circular economy goals through the integration of renewable materials and advanced technologies as an alternative to currently used materials and processes. By advancing in the understanding of natural fibre reinforcements and optimizing production processes, this research contributes to reducing the environmental impact of construction products while offering innovative solutions for bio-based composites in high-performance sectors, approaching them to the market.