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The widespread adoption of Fused Deposition Modeling (FDM) 3D printing technology has significantly increased the consumption of thermoplastic materials, particularly polylactic acid (PLA), due to its biodegradability, recyclability, and ease of processing. While the environmental benefits of PLA are evident compared to petroleum-based polymers [1], the rapid growth of additive manufacturing has also led to a considerable accumulation of PLA waste, necessitating efficient recycling strategies. Mechanical recycling by shredding and re-extruding PLA into new filament is one of the most practical and cost-effective approaches for circular material use [2]. However, the quality and printability of recycled filament depend strongly on extrusion process parameters. This study aims to optimize the extrusion parameters for recycled PLA filament production using a 3Devo filament maker. In this study different parameter combinations were tested, and the resulting filament was analyzed primarily for diameter consistency along its length, with qualitative observations on surface appearance and handling during extrusion. This work offers practical guidance for small-scale recycling setups aiming to efficiently reprocess PLA waste and produce more reliable filament for future 3D printing.

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Improving the Quality of Recycled PLA Filament: Effects of Extrusion Speed and Cooling Conditions

  • 会议论文

  • 发表日期：

    2026年

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  • Radu Firicel,
  • Eugen Constantin Ailenei,
  • Emil Constantin Loghin,
  • Savin Dorin Ionesi

摘要

The widespread adoption of Fused Deposition Modeling (FDM) 3D printing technology has significantly increased the consumption of thermoplastic materials, particularly polylactic acid (PLA), due to its biodegradability, recyclability, and ease of processing. While the environmental benefits of PLA are evident compared to petroleum-based polymers [1], the rapid growth of additive manufacturing has also led to a considerable accumulation of PLA waste, necessitating efficient recycling strategies. Mechanical recycling by shredding and re-extruding PLA into new filament is one of the most practical and cost-effective approaches for circular material use [2]. However, the quality and printability of recycled filament depend strongly on extrusion process parameters. This study aims to optimize the extrusion parameters for recycled PLA filament production using a 3Devo filament maker. In this study different parameter combinations were tested, and the resulting filament was analyzed primarily for diameter consistency along its length, with qualitative observations on surface appearance and handling during extrusion. This work offers practical guidance for small-scale recycling setups aiming to efficiently reprocess PLA waste and produce more reliable filament for future 3D printing.