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<p>Selective laser sintering (SLS) is the most common used 3D printing method for polymer materials. This technology uses a CO2 laser to melt polyamide powder. While previous studies have focused on parameters including laser power, layer height, scan speed, hatch spacing and bed temperature. This research fills a gap in the literature by investigating a currently untested parameter for the SLS process: print surface bed temperature. The purpose of this study is to analyze the relationship between print bed temperature, layer height, and laser power as they pertain to surface roughness and dimensional accuracy. A range of values for parameters were explored in order to assess their combined effect on polyamide 12 3D printed part’s quality. Surface roughness was evaluated using Ra, Rq, Rz and RSM by means of a roughness tester. While dimensional precision was analyzed by measuring the deviation from CAD design using two methods involving 3D scanner and caliper. The results indicate that print surface bed temperature (+ 5 = 182.5&#xa0;°C) increases part powder sintering, decreasing part quality and recycling. Besides, large laser powers and moderate print surface temperatures result in poor dimensional precision and positive error in 3D parts. Furthermore, medium print surface temperature and thinner layer height results on greater dimensional accuracy. Conversely, low print surface temperature and laser power produce 3D parts with negative dimensional accuracy. For surface roughness, lowering the print surface bed temperature offset (-5 = 172.5&#xa0;°C) lowers Ra and Rq. In contrast, maximizing laser power ratio to 3 and printing surface bed temperature offset to 0 reduces the surface&#xa0;quality. As well as, a lower layer height, laser power ratio, and print surface bed temperature offset reduce surface disruptions and enhance surface&#xa0;quality. These findings offer new insights into optimizing SLS processes and set the groundwork for further investigations on print surface bed temperature.</p>

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Indirect effect of print surface bed temperature on surface roughness and dimensional accuracy of SLS polyamide 12 sintered parts

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Fatima-Ezzahrae Jabri,
  • Aissa Ouballouch,
  • Larbi Lasri,
  • Rachid El Alaiji

摘要

Selective laser sintering (SLS) is the most common used 3D printing method for polymer materials. This technology uses a CO2 laser to melt polyamide powder. While previous studies have focused on parameters including laser power, layer height, scan speed, hatch spacing and bed temperature. This research fills a gap in the literature by investigating a currently untested parameter for the SLS process: print surface bed temperature. The purpose of this study is to analyze the relationship between print bed temperature, layer height, and laser power as they pertain to surface roughness and dimensional accuracy. A range of values for parameters were explored in order to assess their combined effect on polyamide 12 3D printed part’s quality. Surface roughness was evaluated using Ra, Rq, Rz and RSM by means of a roughness tester. While dimensional precision was analyzed by measuring the deviation from CAD design using two methods involving 3D scanner and caliper. The results indicate that print surface bed temperature (+ 5 = 182.5 °C) increases part powder sintering, decreasing part quality and recycling. Besides, large laser powers and moderate print surface temperatures result in poor dimensional precision and positive error in 3D parts. Furthermore, medium print surface temperature and thinner layer height results on greater dimensional accuracy. Conversely, low print surface temperature and laser power produce 3D parts with negative dimensional accuracy. For surface roughness, lowering the print surface bed temperature offset (-5 = 172.5 °C) lowers Ra and Rq. In contrast, maximizing laser power ratio to 3 and printing surface bed temperature offset to 0 reduces the surface quality. As well as, a lower layer height, laser power ratio, and print surface bed temperature offset reduce surface disruptions and enhance surface quality. These findings offer new insights into optimizing SLS processes and set the groundwork for further investigations on print surface bed temperature.