Unfortunately, withe Epson 4880 you can no longer see a display of the ink levels in third party carts. To be able to determine which cartridge is low and/or out of ink you can try one of two methods.
1. By feel- lower the blue ink levers and pull out each cartridge. The lightest one is the offending cart and need to be replaced. This is effective if you have not previously weighed the carts.
2. Weigh the ink carts in both their full and empty capacity. This will give you their approximate ink load.
220ML carts with Blackmax ink
Empty = 225-232 gms Full= 385-393 gms
110 ML carts with Blackmax ink
Empty = 130-136 gms Full= 217-225 gms