Impact of Novel Combined Infill Designs and Construction Methods on the Characteristics of Polylactic Acid Parts Printed Using Fused Deposition Modeling

Abstract Fused Deposition Modeling (FDM) is a popular 3D printing technique that is growing rapidly because it can produce complex shapes directly from CAD models. Given its expanding use as an end-use functional component in numerous industries, a thorough investigation of its mechanical behavior is necessary. The large range of FDM process parameters makes it difficult to evaluate the mechanical behavior of these functional pieces because of their inferior mechanical qualities. The purpose of this paper is to examine the compressive and tensile characteristics of the optimal double combining infill patterns using FDM. To create combined infill patterns with an infill density of 80%, 0.15 mm layer thickness, and flat-built orientation, six single printing patterns—Concentric, cubic, Gyroid, Grid, cubic, and Triangle—are utilized. The thermoplastic polylactic acid used to print all infill pattern components is mechanically tested to determine its compressive and tensile strengths. Additionally, the printed samples' printing time was examined. The Tensile test results revealed that the Double infill patterns of,(Concentric+cubic,Concentric+ Gyroid,Concentric+ Grid,Triangle+ cubic,Triangle+ Gyroid,Triangle+ Grid,Gyroid+ cubic,Gyroid+ Concentric, Gyroid+ Grid) double infill patternResults indicate that the combination of concentric and cubic infill patterns achieved a load at break of 2648.35 N, with an applied maximum load of 2673.2 N.. with half-by-half strategy has the highest tensile strength (89.11MPA) compared, with the other infill pattern, and also Compressive tests, the triangle and grid infill pattern combination exhibited the highest compressive strength of 48.44 MPa, with a maximum load of 6.12 kN, has the highest compressive strength compared, with the other infill pattern, and longer printing times were also noted while applying various infill schemes.