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<p>In light of the extensive application of polymeric materials in additive manufacturing (AM) via three-dimensional (3D) printing technology, there is an increasing need to explore and employ materials with diminished environmental impacts. Polyhydroxyalkanoates (PHAs) represent such materials; however, despite their promising potential, they remain underutilized and insufficiently examined within the AM industry. Furthermore, the quality of AM parts is always a weak point, although it has been proven to affect their performance. This study examines 3D-printed coupons fabricated from PHAs and their optimization of quality metrics through the Taguchi L9 experimental design. The selected printing control parameters included feed rate, layer thickness, nozzle heater temperature, and strand width. The quality-related response metrics comprised geometrical accuracy, porosity (through micro-computed tomography), and mean and maximum surface roughness. The thermal and rheological behavior of the material were assessed along with optical microscopy. Nozzle heater temperature was identified as exerting the most significant influence on the majority of the responses. Optimization improved geometrical accuracy by 23%. The other three metrics were improved by an impressive amount of More than 500% amount. The findings presented herein underscore the importance of optimizing and further investigating PHAs in the 3D printing domain, as they provide valuable insights.</p> Graphical Abstract <p></p>

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Critical quality indicators assessment in MEX additive manufacturing with bacteria-derived PHA: the effect of process control parameters

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Nectarios Vidakis,
  • Constantine David,
  • Dimitrios Sagris,
  • Katerina Gkagkanatsiou,
  • Ioannis Valsamos,
  • Amalia Moutsopoulou,
  • Nektarios K. Nasikas,
  • Markos Petousis

摘要

In light of the extensive application of polymeric materials in additive manufacturing (AM) via three-dimensional (3D) printing technology, there is an increasing need to explore and employ materials with diminished environmental impacts. Polyhydroxyalkanoates (PHAs) represent such materials; however, despite their promising potential, they remain underutilized and insufficiently examined within the AM industry. Furthermore, the quality of AM parts is always a weak point, although it has been proven to affect their performance. This study examines 3D-printed coupons fabricated from PHAs and their optimization of quality metrics through the Taguchi L9 experimental design. The selected printing control parameters included feed rate, layer thickness, nozzle heater temperature, and strand width. The quality-related response metrics comprised geometrical accuracy, porosity (through micro-computed tomography), and mean and maximum surface roughness. The thermal and rheological behavior of the material were assessed along with optical microscopy. Nozzle heater temperature was identified as exerting the most significant influence on the majority of the responses. Optimization improved geometrical accuracy by 23%. The other three metrics were improved by an impressive amount of More than 500% amount. The findings presented herein underscore the importance of optimizing and further investigating PHAs in the 3D printing domain, as they provide valuable insights.

Graphical Abstract