I had an idea ones, to build a full scale Airbus A320 cockpit. It took me a while, but after few years, I designed the complete cockpit in 3D, using AutoCAD and SolidWorks.
The knobs that I am sharing, are in .STL format, ready for 3D printing. They are under GPL license.
If some models are corrupted or has wrong dimension, let me know and I will fix them. I tried to design them as real as possible, but they are customized to fit the rest of my A320 cockpit models.
Please share Your knobs and other A320 cockpit stuff in this community (Airbus Flightdeck): https://plus.google.com/u/0/communities/105271139061446342863
Download the knobs from Google Drive: https://drive.google.com/folderview?id=0BzZyLl2eX2WTQS1mMXcxVDNtMjA&usp=sharing