File Format— Your 3D model file must be saved in STL (binary.stl) format. Make sure to export your design in "millimeters" to ensure the proper scale. Size—Your model must fit within the printer's ...

The next step was to let the model process in the app, and once it's ready, you can export it ... for free STL files. This app allowed me to convert a regular apple into a 3D print (more on ...