STLs store the surface of an object as geometric data for a series of points. It is universally accepted and very reliable. It’s an older format that is limited in some ways but sufficient for communicating shape (without color or texture information). STL ( STereo Lithography or Standard Triangle Language or Standard Tessellation Language) format is the “standard” file type used by the majority of 3D printers in the mid and low price range. STEP has been the best of these for two decades, displacing IGES (Initial Graphics Exchange Specification). CAD and CAM systems use a wide range of proprietary and shared formats as their “native” file types. It is viewed as the most reliably interoperable data transfer tool between CAD (Computer Aided Design) and CAM (Computer Assisted Manufacturing) systems. STEP (.STP or STandard for the Exchange of Product Model Data) is a widely employed file type that fully represents 3D design data.
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