201313964851 A description throughout the disclosure some terms are used frequently and are defined as follows a print head is an element of a printing apparatus that applies ink to media a jet stack is the portion of the printing apparatus that includes ejectors for dispensing ink which can include a silicon chip and associated channels a main ink reservoir is a container for ink within the print head a recirculation chamber is a chamber within the main ink reservoir that is in fluid communication with the jet stack an incoming ink chamber is another chamber within the main ink reservoir an incoming ink chamber vent is a vent in the incoming ink chamber that allows for applying pressure or vacuum to the incoming ink chamber with air or another gas a recirculation chamber vent is a vent in the recirculation chamber that allows for applying pressure or vacuum to the recirculation chamber with air or another gas an incoming ink chamber port is an opening in the incoming ink chamber for ink to enter and exit the incoming ink chamber which can also be known as an ink feed port the ink referenced in any of the disclosed printing apparatuses described herein can be a solid ink a water based ink or any other ink used with a printing apparatus that has a fluid reservoir that requires bubble free liquid to exit the reservoir bubbles refer to any air gas or fluid pocket found within the ink of the printing apparatus the disclosed print heads are ultra low purge mass print heads having a fluid reservoir such as a solid ink print head and any water based print systems in the example print heads that use.