Solved: Installed new printer drivers
My older Canon MF4370dn laser printer stopped printing text, only graphics would print when I upgraded to Big Sur.
This was true printing from Word, Preview, and Adobe Acrobat. A temporary solution when printing from Acrobat was to change the advanced setting to "print as image" so that is printed text as a graphic.
I downloaded and installed new drivers from the Canon website dated December 2020, and the problem is completely fixed.
levitator
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Denver, CO, United States