Official downloadable 3D CAD file for the HTC Vive Tracker:
http://community.viveport.com/t5/Developer-SDKs-and-Downloads/Vive-Tracker-SDK-and-hardware-FAQs/ba-p/5477
This is the Official 3D CAD file posted on the "**Vive Developers Community**" in IGS and STP file formats, I have developed the mesh conversion to OBJ file format and units setup in Centimeter in Autodesk 3Ds MAX to be able for work in any 3d software platform.