HP Designjet 500, 510, 800 Ink Cartridge Modification Chip C4844A

FORCE YOUR DESIGNJET PRINTER TO ACCEPT INK CARTRIDGES, even if it thinks they are empty, or if it's rejecting 3rd-party cartridges.  All you have to do is pull the right end cover off. No soldering required, no permanent modification to the printer required.  Guaranteed for life.   Ships same-day.  Is your printer telling you "ink cartridge empty," showing an "X" on a cartridge, or otherwise not accepting ink cartridges? This is the solution. Sometimes the printer will get picky about what cartridges it accepts, and sometimes aftermarket cartridges just aren't built right, so the printer rejects them. The mod chip does not do anything to the ink cartridges themselves. Rather, this mod chip allows you to use ANY cartridge by tricking the printer's logic into thinking there is a FULL set of HP OEM cartridges installed at all times (even if you remove the cartridges from the printer altogether). For this reason, DO NOT START PRINTING WITH THE CARTRIDGES OUT OF THE MACHINE, as this will st