A Review of a Versatile Powder Bed Fusion Technique and Selective Laser Sintering for Orthopedic and Biotechnology Applications

Abstract

The field of Additive Manufacturing (AM), also known as 3D printing, has experienced rapid advancements, revolutionizing traditional approaches to object design and production. This innovative process entails the layer-by-layer deposition of materials in three-dimensional coordinates based on digital files. Additive manufacturing has gained widespread adoption across diverse sectors such as aerospace, robotics, education, medicine, pharmaceuticals, automotive, and construction. Among the techniques employed in AM, the powder bed fusion process is commonly used, including methods like Direct Metal Laser Sintering (DMLS), Electron Beam Melting (EBM), Selective Thermal Sintering (STS), Selective Laser Melting (SLM), and Selective Laser Sintering (SLS). The SLS 3D printer, as a powder bed fusion technique, has undergone multiple modifications to enhance precision and reduce operational expenses. By utilizing a high-power laser, the SLS 3D printer selectively fuses or sinters powdered materials, typically polymers or metals, to fabricate three-dimensional objects. The printer bed is heated to just below the material's melting point, and the laser precisely targets specific areas based on the digital design file. As the laser heats the powder particles, they fuse together, forming a solid layer. This layer-by-layer process continues until the 3D object is fully realized. The SLS 3D printer has found practical applications in sectors such as aerospace, medicine, and pharmaceuticals. In the aerospace industry, it is employed to manufacture lightweight components featuring intricate geometries. The medical field benefits from the SLS 3D printer's ability to produce customized and precise implants and prosthetics. Additionally, the pharmaceutical industry utilizes this technology for the creation of drug delivery systems with controlled-release properties. The SLS 3D printer has undergone significant advancements as a powder bed fusion method, allowing for the production of highly precise and customized items with complex geometries. Improvements have been implemented to enhance accuracy and reduce operational expenses. Its versatility makes it suitable for diverse industries.