When should I refill ink? Should I wait until printer stops printing?

[jopereira]

... Brother MFC-440CN - but then, these Brother compatible cartridges I bought are just tanks, BIG tanks...

this is entirely my own opinion and nothing else: but that printer + others brought out at the same time are some of the worst printers ever made by mankind!
it's slow... prints are aweful... prints are wet!
sorry... jopereira... nothing against u... i've just vowed never ever ti get a brother (or lexmark) printers!
had to get that off my chest!

But I spent 6 in ink and I'm still using it (THREE YEAR had pass)... yes, 1.06/100ml (http://www.do-patronen.de/index.php....html&XTCsid=e198fe2c001e91382ec03c858da4501d)
I've recently made profiles and when I finally got my BROTHER to output acceptable prints, the MX870 deal was too good to turn my back on it so I bought it. That has the only reason I'm still *not entirely happy* with MX870 acquisition - and my MX870 cost me less than my BROTHER !!! (115 MX870, 129 BROTHER).

 

[OM2]

well if it was good for u... then that's ok