Ink jet driven by mircrocontroller

I want to develop a cheap slip printer - prints onto a card as the card is swiped (or slipped) past the stationary print head. I am looking for some one to repeat a hack for a conceptual prototype of a slip printer using consumer inkjet printer cartridges. Please refer to [login to view URL] The idea is to use the economies of scale of consumer print cartridges - which have both ink well and print head integrated into a disposable package. Description: * Driven by a battery (9V probably easiest) with boost circuitry to drive the ink jet * On trigger (ideally modulated opto sensor near the print head) the print routine should start * To start we will print series of numbers XXXX-XXXX-XXXX-XXXX held statically in memory, completely time based to start with (i.e. assume average swipe speed and print routine runs based on that) * The circuitry needs to be well documented and the code well commented * Extensions to consider (but not implement): - timing the print by measuring the position of the card - Changing the string printed based on a button selection before swiping - Zigbee or other low-data wireless connection to computer for issuing new strings