Most Unix systems manage the printers through CUPS, the Common Unix Printing System. In order to access these printers, CrossOver needs the libcups 32-bit library.
If this library is missing Windows applications will still work. However you may find that they don't see any printer and are thus unable to print. So this library is particularly important for all office-type applications.
To install this library, run one of the following commands as root, or look for the corresponding package names in your favorite package manager: