Here at Continuink we have been dealing with customers both business and domestic for 6 years.  We sell converted printers that do not need cartridges to the converted and we fill cartridges so we have seen and heard a whole host of horrors.  For example there is an HP cartridge on the market that should contain 20ml of ink but the internal volume is blocked off so that we can only fill it with 5 ml of ink.

Here you can clearly see the foam that holds the ink in the left hand cartridge uses all the available volume but in the right hand cartridge there is more air than foam.

What a rip-off!  Not only that but think about all those extra cartridges and their associated packaging going into Landfill.  HP are not the only guilty company either.  Lexmark and Canon are also at it.  Please tell us about any bad experience you have had with a printer and what you did about it.

So the advice is purchase XL or extra large cartridges for your printer if you can.