An algorithm for directionally tailored toolpath generation for fused deposition modeling

Abstract

Fused Deposition Modeling (FDM) is an Additive Manufacturing (AM) process in which a thermoplastic material is extruded through a nozzle along a two-dimensional path specified by machine code to create a layer. Multiple layers of differing shape are stacked to create a three-dimensional object. This process is generally reserved for rapid prototyping as it is quick, but not strong. As applications tend to be focused on speed, as opposed to function, commonly available software does not consider the loading scenarios or anisotropy inherent in the method when generating print paths for components. As the anisotropy is a function of FDM process parameters, principally raster orientation, the raster orientation should be able to be optimized for a given loading scenario. The purpose of this paper is to describe a method of generating print paths to account for both the inherent anisotropy as well as loading conditions to generate functionally tailored components that should be safer, more reliable, and more useful in production applications.