Infill refers to the internal structure pattern that fills the hollow spaces inside a 3D printed object. It provides structural support and strength while using less material than a solid print. The infill pattern and density are crucial parameters that affect the print's strength, weight, material usage, and printing time.
There are several common infill patterns available in slicing software. Grid infill creates a simple cross-hatch pattern that provides good strength and is relatively fast to print. Triangular infill offers excellent strength and is often used for structural parts. Honeycomb infill provides a good balance of strength and material efficiency, while gyroid infill offers isotropic properties and good strength-to-weight ratio.
The infill density, typically expressed as a percentage, determines how much of the internal volume is filled. Higher densities (20-50%) provide more strength but use more material and take longer to print. Lower densities (5-15%) save material and time but may result in weaker parts. The optimal density depends on the intended use of the printed object.
For decorative objects, very low infill (5-10%) is often sufficient. Functional parts that need to bear loads typically require higher infill (20-40%). Some slicers also offer adaptive infill, which automatically adjusts the density based on the geometry and stress requirements of different parts of the model.
Infill settings can also include parameters like infill overlap (how much the infill connects to the outer walls) and infill speed. These settings help ensure good adhesion between the infill and the outer shell while optimizing print time and quality.
