Brother TN-2080 refilling instructions
Brother Toner Cartridge TN-2080 refills like most Brother Toner Cartridges
Appearance of the cartridge assembled with a drum unit.
The TN-2080 cartridge has a small capacity. Holds about 60 grams of toner
Thus, Brother TN-2080 can print from 500 to 700 pages – this is the volume of his refueling.
To refill this cartridge, you need to unscrew the three side cover screws and remove the cover.
The starter cartridge (the one that comes with the printer) will not have a large gear for zeroing the counter. In the photo, it has a newer look than the others, because was installed later and did not have time to “grow old”
Detaching the plastic holder
To remove it, pry it open with a flat screwdriver. 
Then you need to pry off with a screwdriver, as shown in the photo below the magnetic roller holder.
The magnetic roller can now be removed
Unscrew two screws to remove the metering ruler.
We clean the toner cartridge from the remains of old toner and dust. Wipe the dosing ruler and magnetic roller with acetone and a cloth.
Fill the cartridge with new toner through the mounting hole of the magnetic roller. And then the cartridge can be assembled in reverse order. 
