Well.... You'd think it would be simple to get a defective ink cart replaced. Evidently not. I'm afraid it looks like I'm out the cost of the twin pack as I'm almost positive that paying for service will be far more expensive than ordering new carts. Here's the response from ATLEX. Then again.... where there's a will there's a way...
Because this order is greater then 30 days old, the manufacturer warranty will apply to the defective cartridge.
CALL 1-800-HPINVENT (1-800-474-6836)
Before you call, please have the serial number of your printer and your credit card available.
Once the menu plays, use the following choices to get to the Designjet technical support line:
(your printer name) “Z3100”
You will then be connected to an HP service rep who will verify the warranty of your printer. Before a technician can replace a defective cartridge, it must be determined that the issue is with the cartridge itself and not the actual printer.
PLEASE NOTE: ~if your printer is out of warranty, you will have to pay for the technical service call. Once connected, if it is determined that your cartridge in fact has a warranty issue, the cartridge will be replaced and the price of your call refunded.