EPSON Large format printer carts such as the 80 – 110 – 220 – 350 and 700ml are designed to allow extra ink volume when they are filled at the factory. You “Officially” pay for the reported volume BUT they do contain more than the official volume. SO when they go empty they are normally thrown out.
Well, in the case of the 80ml ones you are throwing out about 10 – 15 ml of ink. In the 350ml which I illustrate in this video you are throwing out at least 40-50 ml of OEM inks that could be put to use filling refillable carts for your K3 EPSON printers!
So now you know ono of my best kept secrets!