Optimization of these parameters led to an overall increase in quality and improvement of sealing properties. Filament feed rate, wall geometry and G-code-defined wall structure were found as primary parameters that influence the quality of 3D-printed products. Using this approach it was shown that the wall permeability of a printed object depends on its geometric shape and is gradually reduced in a following series: cylinder > cube > pyramid > sphere > cone. This article describes a simple and efficient approach for assessing the quality of 3D printed objects. The major disadvantage of FDM-created products is their low quality and structural defects (porosity), which impose an obstacle to utilizing them in functional prototyping and direct digital manufacturing of objects intended to contact with gases and liquids. Additive manufacturing with fused deposition modeling (FDM) is currently optimized for a wide range of research and commercial applications.
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