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(a) Diagram illustrating the MarkForged® FFF printing process; (b) internal structure of C-CF/PA composites, featuring PA roof and top layers, along with intermediate layers reinforced with C-CF. The fiber infill is oriented at varying angles (0°, 90°, 45°, 60°), based on the chosen layup configuration, with a PA contour surrounding each layer [51]. Reproduced with permission under CC BY 4.0, © 2022 MDPI.
