Optimizing recycled PET 3D printing using Taguchi method for improved mechanical properties and dimensional precision

Abstract Rapid plastic consumption has increased global plastic waste, with polyethylene terephthalate (PET) widely used in packaging. Recycling PET is challenging, as conventional methods often fail to manage the growing waste stream. Additive manufacturing (AM) offers a way to repurpose PET waste into useful products. Preserving the mechanical and physical properties of recycled PET (rPET) during printing is essential. This study used a design of experiments approach to optimize AM parameters, including nozzle temperature, bed temperature, and print speed. Mechanical tests evaluated tensile strength, Young’s modulus, and failure strength. Results revealed optimal conditions that improve part quality and performance. The study identified optimal printing parameters that significantly enhance both dimensional accuracy and mechanical properties of rPET parts, validating their suitability for functional AM applications and advancing circular economy efforts.