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With the development of 3D printing, continuous fiber reinforced composite (CFRTP C) 3D printing has received widespread attention. The print head is critical to distinguish between different components of the printing material. The printing nozzle is the key of CFRTPC 3D printing nozzle. Based on the "independent extrusion" type CFRTPC 3D printing, this paper studies the length of the heating zone of the continuous fiber reinforced filament (CFRF) printing nozzle. The research results show that when the CFRF printing speed is 300 mm/min, taking CFRF/PLA as an example, the effective heating zone length of the printing nozzle is between 2.62–5.45 mm, and the printing temperature range is between 204–234°C. Comprehensive consideration, the optimal printing zone length is 3.6 mm and the optimal printing temperature is 220 °C. The research of this paper is of great significance to the rapid development of CFRTPC 3D printer. [ABSTRACT FROM AUTHOR]

This article focuses on 3D printing of continuous glass fiber reinforced composites-polylactic acid by fused deposition modeling. An innovative continuous fiber reinforced composite 3D printer and self-made continuous glass fiber reinforced filament-polylactic acid are applied to study the influences of process parameters including printing temperature, speed, layer height, and fiber volume fraction on mechanical properties of continuous glass fiber reinforced composites-polylactic acid printing samples. Tensile and three-point bending tests are carried out to explore the mechanical responses of printed samples. Experimental results show that the mechanical properties of continuous glass fiber reinforced composites-polylactic acid printing samples are better than those of polylactic acid samples. The tensile and flexural strengths of the specimens are increased by 400% and 204% when the fiber volume fractions are about 5.21% and 6.24%, respectively. The microscopic observations of the fracture surfaces of the tensile samples are also conducted to analyze the influences of layer heights on tensile strength and failure mechanism. [ABSTRACT FROM AUTHOR]

The unique structure of nacre is composed of 'bricks' and 'mortar,' which gives it excellent damage resistance. In this study, nacre-like bionic ceramic scaffolds were 3D-printed using vat photopolymerization (VPP) technology, filled with polymer, and reinforced with carbon fiber to create high-strength and high-toughness carbon fiber-reinforced bionic composites. This approach leverages additive manufacturing technology to easily overcome the challenges of fabricating complex bionic structures with a simple and flexible production process. It offers a practical method for developing other lightweight, high-strength, and tough bionic materials. The microstructure of the composites was observed using scanning electron microscopy and energy dispersive spectroscopy. Additionally, finite element method and molecular dynamics simulations were performed on the composites. The results indicate that the composite material increased the flexural strength by 293.52 % and the fracture toughness by 109.36 % compared to solid ceramic parts. The primary toughening mechanisms of carbon fiber include crack deflection, fiber "pull-out," and "debonding" within the composite. [Display omitted] • Nacre-like biomimetic composites were fabricated via vat photopolymerization. • Effects of various fillers on flexural properties were investigated. • Atomic-level insights on biomimetic structures were offered by molecular dynamics. • Finite element method reveals filler interaction with the nacre scaffold. [ABSTRACT FROM AUTHOR]