How do I fill my laser printer cartridge?

The best thing to do is purchase a new or remanufactured one as you really don't refill a toner cartridge yourself. There really aren't any generally accessible suppliers of toner for after-market refilling like there is with ink cartridges. When toner cartridges are remanufactured they replace (or are at least supposed to) the drum, cleaning blade and toner along with checking for any other problems with the cartridge, and then seal it so that it doesn't leak (though that is not always fool-proof and it is common for many to leak). I also suspect that it would be a very dirty job as toner is a very fine powder that would make a lot of dust trying to pour it in and too many things can go wrong and damage to the drum would be likely due to the proximity of the toner so a do it yourself kit is out of the question. You can take it to a remanufacturer and have them do it for you, but it would be easier just to turn it in at a local store that accepts them and purchase a replacement.  more