When exporting to STL in your CAD package, you may see parameters for chord height, deviation, angle tolerance, poly count, or something similar. 3D printing can only accept a certain file size therefore it’s important to find a balance between your model, its desired surface, and the 3D printing process of your choice. However, the smoother/ less faceted your surface is, (the higher the poly count or triangulation) the larger your file. If the STL is coarse and faceted the physical 3D printed model will be coarse and faceted as well. You cannot build the model smoother than the STL file. The parameters used for outputting a STL will affect how much faceting occurs (Figures 2 and 3). The triangulation (or poly count) of a surface will cause faceting of the 3D model. STL is a triangulated representation of a 3D CAD model (Figure 1). STL is the standard file type used by most additive manufacturing systems.
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