Save at least two thirds the cost of an original cartridge and halve the CO2 footprint. Learn the simple approach we used to do ten successful refills without needing to change the chip. Follow in our footsteps and learn how we did it, not how we imagine it could be done. Products compatible with the following Hewlett Packard laser printers: M252, M252dw, M 252, M 252dw, M277, M277dw, M 277, M 277dw, M252n, M 252n, M277n, M 277n. The following HP part numbers can be refilled: 201a, 201x, CF400a, CF401a,

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