Some printers will be difficult and keep giving you error message, or will report wrong ink levels in ink monitor. In this case turn printer off and unplug it from wall. Wait about 20 - 30 minutes and try it again.

Also try rotating between 3 different cartridges when refilling. Some printers remember last two or three cartridges and can give you problems if you keep installing same refilled cartridge.

If you have an HP and printer prints but ink levels are not right you probably need to do "Tape Trick" Follow links below for type of cartridge you are refilling for correct procedure.

HP cartridges #'s 15, 45, 78 http://www.repeatotype.com/instructions/HPReset.pdf

HP cartridges #'s 56, 27 http://www.repeatotype.com/instructions/HP56Reset.pdf

HP cartridges #'s 57, 28 http://www.repeatotype.com/instructions/HP57Reset.pdf

If you have just refilled a cartridge and are having problems getting it to print properly check to make sure that you didn't cause a vapor lock problem by sealing breather holes or refilling holes. Exception, of course, to cartridges profiled above.

Epson cartridges generally work well with refill holes uncovered if it was refilled from top. The new design of Epson cartridges is very confusing. These are new skinny ones like T04xx and T08xx series of cartridges. The OEM cartridges are comprised of a series of chambers. They are harder to refill than their generic counterparts and some instructions will tell you to drill top and others will tell you to drill in bottom. Sealing top hole is not mandatory while sealing bottom is a must. Some generic versions of these cartridges are sponge filled and are far simpler to refill. You can drill on top without complication and you don't have to reseal.

So bottom line is if you are having printing problems after you refill be sure you have not caused problem by sealing cartridge and creating a vapor lock.