Thingiverse contains millions of free models that are meant for 3D printing, and almost all of them are available in the STL format. STL file sites that are specifically catered towards 3D printer users are better because they usually give designers space to list recommended print settings, and more of the STL files on the site will be actually 3D printable!īy far, the most popular site to find an STL file is Thingiverse. But not all of these sites are meant for 3D printing. Today, finding STL files is super easy as there are many different 3D model repositories that contain STL files. Cura, PrusaSlicer), and these programs turn the 3D part into a G-code file, which your printer actually uses to make the model. Moreover, STL files are accepted by basically every 3D slicer (e.g. While a 3D printer, such as the Creality Ender 3, can interpret or print an STL file directly, it’s the main format for storing 3D model data. STL files are the primary file format in the 3D printing space. Want to 3D print something? You’ll need an STL file first!