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<p>To improve the interlayer bonding strength of fused filament fabrication (FFF) 3D printing parts, this study introduced a gas-assisted 3D printing technology and systematically analyzed the properties of thermoplastic polyurethane (TPU) parts printed by this method. Experimental results show that with the assistance of high-temperature and high-pressure gas flow, gas-assisted 3D printing improves the temperature field uniformity and significantly enhances the interlayer bonding strength of TPU parts. Compared with conventionally printed parts, the gas-assisted printed parts with 100&#xa0;μm layer thickness exhibit 96.36% increase in interlayer tensile strength and 72.44% improvement in elongation at break. Meanwhile, the improved temperature field also helps eliminate pores in TPU part, which further improves the transparency of printed parts. In addition, the gas-assisted technique optimizes the microstructure of TPU parts, which effectively reduces the inner porosity and surface roughness. This study provides an effective technical method for enhancing the quality of 3D-printed TPU products and broadening their application in high-performance fields.</p>

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Improved interlayer bonding in fused filament fabrication via gas-assisted 3D printing

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Yinglan Liu,
  • jianhua Xiao,
  • yanfeng Gao,
  • mincong Li,
  • Xiaojie Zhang,
  • Jincheng Wang

摘要

To improve the interlayer bonding strength of fused filament fabrication (FFF) 3D printing parts, this study introduced a gas-assisted 3D printing technology and systematically analyzed the properties of thermoplastic polyurethane (TPU) parts printed by this method. Experimental results show that with the assistance of high-temperature and high-pressure gas flow, gas-assisted 3D printing improves the temperature field uniformity and significantly enhances the interlayer bonding strength of TPU parts. Compared with conventionally printed parts, the gas-assisted printed parts with 100 μm layer thickness exhibit 96.36% increase in interlayer tensile strength and 72.44% improvement in elongation at break. Meanwhile, the improved temperature field also helps eliminate pores in TPU part, which further improves the transparency of printed parts. In addition, the gas-assisted technique optimizes the microstructure of TPU parts, which effectively reduces the inner porosity and surface roughness. This study provides an effective technical method for enhancing the quality of 3D-printed TPU products and broadening their application in high-performance fields.