Printers Migration drivers and ports

For the Printer Migration

Server 2012 Print Management tool supports an export feature, this will export the printers, print queues, printer drivers to a print migration file. just go to print management > right click your print server > choose export. then take the file to you new print server and do an import.

you can access the print migration directly as well see the link below:

https://technet.microsoft.com/en-us/library/cc773832(v=ws.10).aspx

another option is to use the windows server migration tools:

https://technet.microsoft.com/en-us/library/dd379545(v=ws.10).aspx

here is a print migration guide:

https://technet.microsoft.com/en-us/library/dd379488(v=ws.10).aspx

as for redirecting the users existing printers, are the computers domain joined?

if so then I would use Group Policy Preferences to map new printers to their computers, set the default printer and remove the old ones.