Using a black marker, draw something relatively simple. An animal works well. For this tutorial I am going to use a simple outline of a dinosaur. Remember to keep your edges prominent and make them have good contrast. You need to make sure you're using bright white paper, not cream or tan. If you make any marks that are not part of your drawing, the conversion tools may accidentally include them in the vector. Once you've finished, scan it or take a good photo. Store it somewhere on a computer.

IMPORTANT: Remember, only the filled in black spots will be 3d printed. If you draw an outline, it will 3D print an outline. If you fill it in, the 3D print will be filled in also. It may appear filled in in the software, but remember: if you didn't fill it in, it's going to be hollow.