I have had a Scribbler project idea sitting idle since 2013
due to poor CAD files for the S2 chassis. With the S3 update, newer, cleaner CAD files are finally available and guess what? They import directly in to Fusion 360.
On the S3 product page, download the Scribbler S3 Open-Source files
Within Fusion 360, select Upload and select all of the unzipped files.
In the next box, Fusion 360 will ask for the "Top Assembly" file. Select "S3.asm.1"
Upload the files and when it is complete, you will have most of an S3 within Fusion 360:
All parts import as plain gray steel, so you need to modify the material available in your project and appropriately assign each material/color to components. I am still learning Fusion360, so I haven't modified my files completely yet.
Not all parts of the S3 are included in the CAD File Zip download from Parallax, so several key things are missing: motors, one encoder shaft, etc.
Parallax: Could you review the CAD files and see about getting a complete CAD package?