Kodak has posted an unsupported hack that has been reported to enable printing to a Kodak printer not supported in OS X 10.10 ("Yosemite"). Perhaps it would have the same effect with some other kinds of printers that aren't supported in Yosemite. I have no information about that, one way or the other.
I have not tested the hack myself and I don't know all the possible effects. As far as I know it will not break the compatibility of printing software that is already compatible with Yosemite. It may degrade the security of the web administration interface of CUPS. That interface is not enabled by default, and will not be enabled by the procedure described here. Even if it were enabled, I know of no way it could be exploited, with or without the modification. Nevertheless, if you have enabled the web administration interface, you should disable it if you decide to follow these instructions. If you don't know what the web administration interface is, you haven't enabled it.
If you don't like the results of the procedure, reset the printing system.