Improving the mechanical properties of 3D printed polymer-based materials without compromising their printability can be achieved through various approaches:1. Material selection: Choose high-performance polymers with better mechanical properties, such as polycarbonate PC , polyetherimide PEI , or polyphenylene sulfide PPS . These materials have higher strength, stiffness, and thermal stability compared to standard 3D printing materials like PLA or ABS.2. Material modification: Incorporate additives, such as carbon fibers, glass fibers, or nanoparticles, into the polymer matrix to enhance the mechanical properties of the printed parts. These additives can improve tensile strength, stiffness, and impact resistance without significantly affecting printability.3. Printing parameters optimization: Adjust the printing parameters, such as layer height, infill density, and print speed, to achieve better mechanical properties. For instance, using a lower layer height and higher infill density can result in stronger parts with better interlayer adhesion.4. Printing orientation: Consider the loading direction and optimize the part orientation during printing to maximize the mechanical performance. Printing parts in the direction of the applied load can help improve strength and reduce the risk of failure due to weak interlayer bonding.5. Post-processing techniques: Apply post-processing techniques, such as annealing, to improve the mechanical properties of the printed parts. Annealing can help relieve internal stresses, improve crystallinity, and enhance interlayer adhesion, resulting in stronger parts.6. Hybrid printing: Combine different materials or printing techniques to create parts with improved mechanical properties. For example, use a dual-extrusion printer to print a part with a strong, rigid material for the outer shell and a flexible, impact-resistant material for the core.7. Software optimization: Utilize advanced slicing software that allows for better control over the printing process and material distribution. This can help optimize the mechanical properties of the printed parts by adjusting parameters such as infill patterns, shell thickness, and support structures.By implementing these strategies, it is possible to improve the mechanical properties of 3D printed polymer-based materials without compromising their printability.