A study of 3D printing step effect repair strategies based on the incompletely solidified state of materials

DOI:	10.11809/bqzbgcxb2025.02.037
Keywords:	FDM; printing parameters; 3D printing; step effect; incomplete solidification state
Abstract:	In the process of Fused Deposition (FDM) 3D printing, the step effect often occurs when printing bevel surfaces due to the limitations of the 2.5D layer by layer manufacturing process. Among them, the step effect also occurs during the construction of supported oblique surfaces in tilted slice unsupported printing, leading to a decrease in the interlayer adhesion strength, which adversely affects the mechanical properties of the printed parts. To address this problem, this paper proposes a strategy to adequately repair the step effect, study the influence law of linear contour and arc contour on the step structure, repair the gap of the step effect based on the fluidity of the print material and the state of non complete solidification, and further explore the influence of the parameters of the print layer height, the print speed, the extrusion speed, the print temperature and other parameters on the fluidity of the material, which can effectively fill in the step structure on the of the missing print material. Taking PLA printing as an example, the effectiveness of the proposed strategy is proved through comparative experiments in the same situation. The experimental results show that under the process conditions of printing temperature of 210°, ambient temperature of 40°, printing layer height of 0.1 mm, and printing speed of 60 mm/s, the maximum repair rate of the step effect reaches 98%, and the surface quality is better.
Issue:	Vol. 46 No. 2 (2025)
Published:	2025-02-28
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