The 420 cartridge should be good for 1200 or so prints. Keeping in mind the way they measure it is a tiny block of text is a page. The high cap is 2600 or so. HP makes an officejet that matches that...as long as you disable color those inkjets are super cheap to run. The one I reference is the 8600 pro. That brother you bought is great though they force you to change the drum after 10k pages or so

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1985 CA 300D Turbo , 213K mi