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What is an STL file?

The STL file is the universal, industry-standard format for 3D printing, representing 3D geometry as a surface of interconnected triangles. While highly compatible across hardware and software, it is a "dumb" format that lacks the parametric design data of original CAD files. Success with STL files relies on mastering export settings to balance triangle density, ensuring your prints are smooth and accurate without becoming unmanageably large.