Creating a 3D Model with Tinkercad - 3D Printing: Build your Own 3D Printer and Print your own 3D Objects - page 146

Figure 7.23 To print with a 3D printer, you must download the STL file.
A window appears like the one in Figure 7.24 . Click the STL button and then
choose a location to save the file.
Figure 7.24 Click the STL button to begin the download.