We have an MF644CDW and for some time the printer has indicated the black cartridge is empty. Knowing that - unlike inkjets - running a laser on an empty cartridge will not hurt the printer, we decided to print whatever black pages may be left. That was many pages ago and it is still going strong. We figure that either (1) the empty indication occurs at something short of empty (like say 20%) or (2) the printer is smart enough to automatically mix the color cartridges to make black. Any thoughts on what may be at play here are welcome except comments that I am cheap - to which I have little defense beyond defining my frugality as "maximal resource management." 😏
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