Multi-Axis FDM 3D Printing

Abstract

Fused Deposition Modeling (FDM) is the most widely used additive manufacturing technique, but its reliance on a single principal build direction introduces anisotropic material properties, limited surface quality, and strict geometric constraints requiring supports. Multi-axis FDM offers a pathway to overcome these limitations, yet existing solutions demand complex, costly hardware and bespoke slicing software. Here, we present a pragmatic approach to multi-axis fabrication that leverages standard 3-axis printers and conventional slicing workflows through the integration of in-situ printed work-holding components. This method enables sequential reorientation of parts within the printer’s coordinate system, allowing fabrication across multiple build directions without specialized equipment. We demonstrate the technique through case studies including a multi-axis cube and a turbine blade, achieving reduced support requirements, improved mechanical interfaces, and tolerances within 100–300 µm depending on geometry and holding configuration. Furthermore, we evaluate multi-material adhesion across common thermoplastics, identifying strong candidates for multi-axis, multi-material constructs. This accessible framework broadens the design space of FDM and lowers the barrier to advanced geometries, offering a versatile tool for both research and practical applications.