My relatively new HP printer had a lot of printing problems due to smearing and darkening of the edges. The drum kept getting dirty and I replaced it. This costs a lot less than the HP part, works great, and doesn't generate the error messages that third-party components sometimes cause.
Inkjet MFP HP Ink Tank Wireless 419, color, A4, black
52 Review
4-Pack Toner Bank Compatible Replacement for Brother TN760 TN-760 TN730 TN-730 Black Toner Cartridge for MFC-L2710DW DCP-L2550DW HL-L2350DW HL-L2390DW MFC-L2750DW HL-L2395DW HL-L2370DW Printer Ink
11 Review
Get Quality Prints with HP 78A/CE278D Toner-Cartridges for LaserJet Pro M1536 and MFP P1606
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Cartridge NV Print CE285A for HP LaserJet Pro P1102/P1102w/M1132/M1212nf/M1217, black
13 Review