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<p>Fused filament fabrication is one of the most prevalent extrusion-based additive manufacturing techniques, wherein each layer is constructed by sequentially placing adjacent rasters. Improving the bonding strength between rasters and layers is crucial for enhancing the mechanical properties of printed parts. This study aims to theoretically establish the relationship between the temperature of the deposited raster and various printing parameters, identifying factors contributing to temperature reduction. Subsequently, the effects of printing parameters—including nozzle temperature, extrusion width, layer height, printing speed, and infill pattern—on the tensile strength of a single layer are investigated to evaluate inter-raster strength. Theoretical findings indicate that at a nozzle temperature of 210&#xa0;°C, an extrusion width of 0.8&#xa0;mm, a layer height of 0.3&#xa0;mm, and a printing speed of 80&#xa0;mm/s, the deposited raster exhibits a minimum temperature drop of 38%, reducing from 210 to 152&#xa0;°C. Additionally, nozzle temperature, extrusion width, layer height, and printing speed progressively impact temperature drop, with the maximum drop observed at 303% (from 210 to 52&#xa0;°C). Analysis of variance from tensile test results reveals that the effects of the infill pattern, printing speed, extrusion width, layer height, and nozzle temperature are 82.24%, 6.39%, 5.91%, 2.74%, and 2.72%, respectively. The highest tensile strength recorded is 72&#xa0;MPa, achieved using a nozzle temperature of 210&#xa0;°C, an extrusion width of 0.8&#xa0;mm, a layer height of 0.3&#xa0;mm, a printing speed of 80&#xa0;mm/s, and a zigzag infill pattern. Remarkably, the tensile strength increases by 109%, from 34.5 to 72&#xa0;MPa, across all samples. Furthermore, samples with maximum inter-raster strength showed no signs of necking or inter-raster separation.</p>

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An Experimental Study on the Influence of Printing Parameters on Inter-raster Bonding in a Single-Layer Polylactic Acid Fabricated via Fused Filament Fabrication

  • 期刊论文

  • 发表日期：

    2025年1月30日

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  • Behnam Akhoundi,
  • Amin Safi Jahanshahi

摘要

Fused filament fabrication is one of the most prevalent extrusion-based additive manufacturing techniques, wherein each layer is constructed by sequentially placing adjacent rasters. Improving the bonding strength between rasters and layers is crucial for enhancing the mechanical properties of printed parts. This study aims to theoretically establish the relationship between the temperature of the deposited raster and various printing parameters, identifying factors contributing to temperature reduction. Subsequently, the effects of printing parameters—including nozzle temperature, extrusion width, layer height, printing speed, and infill pattern—on the tensile strength of a single layer are investigated to evaluate inter-raster strength. Theoretical findings indicate that at a nozzle temperature of 210 °C, an extrusion width of 0.8 mm, a layer height of 0.3 mm, and a printing speed of 80 mm/s, the deposited raster exhibits a minimum temperature drop of 38%, reducing from 210 to 152 °C. Additionally, nozzle temperature, extrusion width, layer height, and printing speed progressively impact temperature drop, with the maximum drop observed at 303% (from 210 to 52 °C). Analysis of variance from tensile test results reveals that the effects of the infill pattern, printing speed, extrusion width, layer height, and nozzle temperature are 82.24%, 6.39%, 5.91%, 2.74%, and 2.72%, respectively. The highest tensile strength recorded is 72 MPa, achieved using a nozzle temperature of 210 °C, an extrusion width of 0.8 mm, a layer height of 0.3 mm, a printing speed of 80 mm/s, and a zigzag infill pattern. Remarkably, the tensile strength increases by 109%, from 34.5 to 72 MPa, across all samples. Furthermore, samples with maximum inter-raster strength showed no signs of necking or inter-raster separation.