If you are looking at submitting a patent application, you probably need to create a line drawing version of your work. This site has a great walkthrough guide:
Click this link to go to the website which walks you through it.
For a 3D model the easiest method I found was to just create a couple of versions of the model (eg. collapsed and expanded), then capture some screenshots of them from different perspectives. Then put all the screenshots into 1 "big picture", and follow that guide.