Fig. 14 | Scientific Reports

Fig. 14

From: Influence of layer thickness and extrusion ratio on strand morphology, porosity, surface roughness, and anisotropic mechanical properties in FDM

Fig. 14

(e)-(f) show the surface contours and surface roughness Ra of parts with different γ. When γ increases from 100% to 110%, the surface roughness decreases due to the filling of melt into the pores between the strands, and Ra decreases from 7.82 ± 1.01 μm to 6.88 ± 0.15 μm. However, when γ reaches 115%, the excessive melt causes excessive squeezing and significant increment of surface roughness.

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