Importing an STL FileKeyCreator \ File \ Import \ STL-Import \ Importing-an-STL-File
When STL is selected from the File>Import submenu, the Open dialog appears, through which you are able to specify an STL (*.STL) file to import. Click on the OPTIONS button to change the available import settings. STL files contained geometry comprised of polyline triangles. Using the Polyline Display Options you can choose how the polylines will be handled upon import. Once the settings available from the Read STL Polygon File dialog have been configured, select OK. The file is then read in.