This option is designed only to be used when using our SDK CardExchangeInside, in this case the PrintServer license is provided through the client.
For standard CardExchange use you should not change this setting, you need to have a license installed for the print server on your SBS license manager.
Although you can set the print server up and start it, it will error when trying to print the way you have it setup.
Hope that helps.
CardExchange Solutions Support Team
"If you define the problem correctly, you almost have the solution." (Steve Jobs)