This study investigates the impact toughness of 3D-printed PLA structures with Hilbert curve and honeycomb infill patterns at various raster angles. Samples were fabricated using Fused Deposition Modeling (FDM) and tested for impact energy absorption using the Charpy test. The results showed that specimens printed at a 90° raster angle exhibited the highest impact absorption. Hilbert curve patterns demonstrated 20.6% less energy absorption than plain samples with 40% infill and 11% higher energy absorption than plain samples with 100% infill, highlighting the significant role of material utilization in enhancing structural integrity.

Laminated composites are a key area of research due to their cost-effectiveness and productivity. Fiber-reinforced laminated composite structures are widely used for their excellent strength-to-weight ratio. These composites are typically manufactured using the Vacuum Assisted Resin Transfer Molding (VARTM) method. In laminated composites, properties are highly dependent on the orientation of the laminates and their proper adhesion with the epoxy matrix. This study focuses on the application of VARTM in fabricating fiberglass laminated composites using three glass fiber laminates oriented at 0°, 45°, and 90°, impregnated with epoxy resin under vacuum assistance. The features of these composites are compared with those of composite with laminates parallel to one other at 0° and 45°. The manufacturing process involved curing the composite sheets for 24 h, followed by cutting tensile specimens according to standard D3039. Results showed that specimens with all laminates oriented at 0° to the loading direction exhibited the highest strength of 253 MPa, while specimens with laminates oriented at 45° showed the lowest strength 69 MPa and highest elongation, i.e., strain of 0.22 mm/mm.