What does anisotropy mean in additive manufacturing?

• A. Variability in properties based on directions.
• B. Uniform properties in all directions.
• C. Variation due to color changes.
• D. Variation due to ambient temperature.

Answer: (A)

Anisotropy means that material properties depend on the direction in which you measure them. In additive manufacturing, parts are built layer by layer, so the bonds between layers can be different from the bonds within a single layer. This often makes properties like strength, stiffness, or toughness vary depending on whether you test along the build direction (up and down through the layers) or within the layer plane (side to side). Because of this directional dependence, the orientation of features and the build strategy matter a lot in AM design and fabrication. To reduce anisotropy, engineers adjust build orientation, optimize scanning or process parameters, and apply post-processing such as heat treatment or hot isostatic pressing. The idea that properties are uniform in all directions describes isotropy, while color changes or ambient temperature variations aren’t about how material properties change with direction.