Effect of layer thickness, deposition angle, and infill on maximum flexural force in FDM-built specimens

Abstract

As the ability to resist deformation under load, flexural strength is an important property of every material. Fused Deposition Modeling (FDM) technology allows users to control the density of models through parameter which is termed air gap or infill. Since lower infill values significantly increase the building speed, test specimens were used with infill between 10 and 30%. Therefore, this paper discusses experimental analysis of the influence of layer thickness, deposition angle and infill on the maximum flexural force in FDM specimens made of polylactic acid (PLA). A 23 factorial experiment without replication was used with three center points. The results indicate a dominant, statistically significant influence of extrusion speed, significant interaction between deposition angle and infill, as well as the nonlinearity of effects.