How to refill your HP Pro M125a, M125nw, M127fn, M127fw, M201n, M201dw, M225dn

Avoid throwing money away and halve CO2 by learning how to refill the HP Pro M125a cluster of printers (HP 83A cartridge).
U Refill Toner, the UK based inventors of the DIY toner refill, work with the printer itself to give you the definitive refill method.