Ink

Ok now i needed a printer and needed to use it right then for a project. The printer its self is sleek and sexy and pretty easy to use the instructions were easy to understand took me no time to getbit up and running. But after 15 copies ummm I had to replace the ink cartriges ( which are expensive) after replacing it 10 copies later i ran out again. How is it first time the ink lasted for 15 the next time it was 10. I tried cleaning the heads, re calibrating it, changing settings notbing worked. It is just not a good quality printer at all. The ink should not be used up that fast.