Infill parameters influence over strength of 3D printed samples by Fused Filament Fabrication

Abstract

Fused Filament Fabrication (FFF) is an extrusion-based technology that uses molten
thermoplastic material to build 3D models additively. Each part is built in a layer-wise fashion and is
composed of walls, bottom/top layers, and internal structure. Regarding the internal structure, also
known as infill, many studies adopted 100 percent infill density for the tested samples, which logically,
is the strongest. However, there are still other infill parameters that were not thoroughly studied. Thus,
this research aimed to investigate the influ-ence of nine infill parameters and two travel parameters
over the tensile proper-ties of 3D printed samples. The experiment was designed using a mixed
Taguchi L36 matrix. All samples were printed with gyroid infill without bottom and top layers using a
polylactic-acid-based (PLA) material. The results show that the strength of samples can be increased
by multiplying the infill line along with an increased overlap between the infill line and the inner wall.