Modular print engines and print engine components that are usable in desktop card printers for personalizing plastic cards such as financial cards including credit and debit cards, identification cards, driver's licenses, and other personalized plastic cards. The modular nature of the print engines and print engine components permit alteration in the specific functionality of the desktop card printers depending upon, for example, the personalization requirements of the plastic cards and intended applications of the desktop card printers. In addition, the modular print engine components can be completely tested prior to installation into the modular print engines to ensure that the modular print engine components are working correctly prior to installation. Furthermore, the modular print engine components add flexibility to the desktop card printers as upgraded functionality and features can be introduced by developing new modular components.