This is great idea that came up to Serasidis Vasilis. And for sure this is great solution when you share printer or other USB device from one computer to another. The problem is that sharing computer has to always on in order to be able to share the device.
So why not to use this USB switch that enables sharing USB devices when sharing computer is OFF. Device is quite simple – software based ATtiny2313 USB controller which communicates with one of two PC’s that have proper drivers installed and control programs started. USB switching is done via relays that won’t affect USB signal quality. Project description is in Greek language, so why not to use an online translator.