![]() In slicers, this is usually defined as a percentage between 0 and 100, with 0% making a part hollow and 100%, completely solid. ![]() Infill density is the “fullness” of the inside of a part. Density Infill density can significantly affect material consumption (Source: BozarthPrime via MyMiniFactory) Let’s take a closer look at different options for infill density and pattern. Meanwhile, 3D printing involves selective extrusion of material in almost any pattern. Similar to injection molding, infill can’t be adjusted, so the interior is completely solid. Subtractive manufacturing, like CNC machining, involves cutting material off of a larger piece of stock. As a result, injection-molded parts are either solid or hollow (with gas injection molding), with no in-between. As you can imagine, due to the nature of this method, controlling internal structures simply isn’t possible. Injection molding involves inserting material into a mold to form a part. Let’s use injection molding and subtractive manufacturing as examples. Infill in 3D printing is different from other, more traditional manufacturing methods. ![]() No “infill” here… (Source: Vision Engraving&Routing via YouTube) But first, let’s look at “infill” across a couple of different manufacturing methods to better understand how it works in 3D printing. In this article, we’ll go over the basics of these aspects as well as some of the most common densities and patterns. The most important of these parameters fall under two fundamental aspects: infill density and infill pattern. These parameters are set in a slicer program when a 3D model is translated into G-code instructions. In 3D printing, you have the ability to define a number of parameters that govern the type of infill used for a part. Though you do have some amount of control over the walls, the infill is much more dynamic and plays a huge role in a part’s strength, weight, structure, buoyancy, and more. The walls, however thick, form the outermost regions of the part, while the infill is whatever exists within them. ![]() In contrast to most other manufacturing techniques, 3D printing allows you to carefully control two mutually exclusive yet exhaustive aspects of a part: exterior walls (or perimeters) and infill. In 3D printing, infill plays an important role in a part’s strength, structure, and weight. ![]()
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