The ink which flows through each nozzle assembly functions as a lubricant and coolant for nozzle: if there is no ink in chamber when resistor turns up heat, nozzle assembly will quickly warp and break apart -- resistor can reach a temperature of hundreds of degrees very quickly! If print head is allowed to begin this process of burnout (i.e. if ink cartridge is not refilled or replaced promptly), damage may range from poor print quality (streaks or lines across page, bad coloration, light or dark patches on page) to serious damage to printer.

It is very important never to attempt to print with an empty ink cartridge. If in doubt, top off your cartridges frequently (the leftover ink from your inkjet refill kit can be stored until next time you top off).

6. Black cartridges are usually easier to refill than color cartridges. This is because they are of a much simpler construction. Color cartridges usually have multiple chambers and it's easy to cross-contaminate colors if you are not careful.

7. Never over fill cartridges. I know what you are thinking, "How can I see inside cartridge, it's black?". If you can't see inside you can use a tooth-pick. It's like a dip-stick to check your oil, like in a car. You can get a pretty good idea how much ink is left.

8. Don't be in a hurry when you refill and don't rely on refilling to meet important deadlines.

9. Always remove cartridge from your printer before attempting to refill it. Drilling top of some cartridges can create a tidal wave of ink inside your printer.

10. Take necessary steps to protect your work area from spills. One small accident can void warranty on those new $330 Gucci loafers.

11. Never insert cartridge in printer if it's leaking. This should go without saying but I know from my emails that people do it all too often.

12. To store empty cartridges or refilled cartridges you should put them in a plastic zip lock bag or wrap them in cling plastic wrap.