Just as it is possible to have too FEW triangles define your part, you can also overshoot and have too MANY triangles which creates a large file, and a level of detail that the printers can't achieve anyways. The level of triangulation, and effectively the amount of faceting, can be controlled during the CAD export to STL. Too few triangles, and a circle becomes a stop sign. The amount of triangulation in the STL file will effect how faceted the surface of the part appears once printed. An STL file is a triangulated approximation of a 3D CAD model. Correctly converting CAD files into STL files is very important in order to print accurate parts.
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