Where can I get a CAD model for the Moto X
In fact, one is available from Motorola here, posted by Reddit user troub (source). It is a .dae file but can be converted using Autodesk FBX Converter (see www.cadstudio.cz/download or www.autodesk.com/fbx). Alternatively, it is posted here on Thingiverse as a .stl file.