A review of melt extrusion additive manufacturing processes: II. Materials, dimensional accuracy, and surface roughness

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Overview on Additive Manufacturing Technologies (2017, background): “As it concerns the process accuracy, the quality of the parts depends on the building orientation, on the layer thickness, and on the feature size [21-24].”
Metal additive manufacturing in the commercial aviation industry: A review (2019, background): “Additive Manufacturing processes by themselves are not able today to produce parts with acceptable mechanical properties and surface roughness for most application requirements [128, 129].”
Additive Manufacturing of Metallic and Ceramic Components by the Material Extrusion of Highly-Filled Polymers: A Review and Future Perspectives (2018, background): “That is, the force transferred from the drive wheels to the filament should be efficiently transferred into the center of the liquefier in the direction of the melt flow, with minimal loss due to filament buckling and compression [2,22,43].”
In situ monitoring of FDM machine condition via acoustic emission (2015, background): “, [3, 52, 53]) has been done for product monitoring during fabrication, to the authors’ knowledge, there is still no study of FDM machine condition monitoring.”