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Additive manufacturing (AM) techniques are combined with the circular economy concept to transform waste polymers into reusable goods. Methods for assessing how recycling plastic affects AM applications have been investigated. In this study, a sustainable additive manufacturing practice that specifically involves recycling expired multi-color polylactic acid (PLA) filaments blended with virgin PLA pellets has been explored. It seeks to validate the mechanical properties of recycled PLA to offer a potential solution to mitigate PLA waste within the AM industry. The experimental methodology involves waste collection, shredding, drying, extrusion, and spooling into new usable filaments. Extruded filaments were then used to print samples according to ASTM D638 utilizing the Taguchi method to optimize mechanical performance. Results revealed that optimized blended 50–50 virgin-recycled PLA samples achieved a tensile strength of 44.07 MPa, closely at par with the performance of virgin PLA. Furthermore, the elongation at break for the recycled filaments was recorded at 3.53%, indicating a minimal loss in flexibility. Confirmation results also conform with the Taguchi prediction indicating successful optimization at a 5% confidence level. These results underscore the potential of recycled PLA filaments to serve as a viable alternative for 3D printing applications, aligning with sustainable manufacturing.

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Mechanical Characterization of Blended Virgin-Recycled Polylactic Acid Filaments for Fused Deposition Modelling Based on Taguchi Optimization

  • 会议论文

  • 发表日期：

    2026年

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  • Manuel Bañaga,
  • Romar Manio,
  • France Timothy Antonio,
  • Emmanuelle Biglete,
  • Ruth Aquino

摘要

Additive manufacturing (AM) techniques are combined with the circular economy concept to transform waste polymers into reusable goods. Methods for assessing how recycling plastic affects AM applications have been investigated. In this study, a sustainable additive manufacturing practice that specifically involves recycling expired multi-color polylactic acid (PLA) filaments blended with virgin PLA pellets has been explored. It seeks to validate the mechanical properties of recycled PLA to offer a potential solution to mitigate PLA waste within the AM industry. The experimental methodology involves waste collection, shredding, drying, extrusion, and spooling into new usable filaments. Extruded filaments were then used to print samples according to ASTM D638 utilizing the Taguchi method to optimize mechanical performance. Results revealed that optimized blended 50–50 virgin-recycled PLA samples achieved a tensile strength of 44.07 MPa, closely at par with the performance of virgin PLA. Furthermore, the elongation at break for the recycled filaments was recorded at 3.53%, indicating a minimal loss in flexibility. Confirmation results also conform with the Taguchi prediction indicating successful optimization at a 5% confidence level. These results underscore the potential of recycled PLA filaments to serve as a viable alternative for 3D printing applications, aligning with sustainable manufacturing.