You are supposed to fine tune the constants yourself for your specific printer when installing TeX and METAFONT on your system.

The pre-defined modes can be found here: ftp://ftp.tug.org/tex/modes.mf

The art of optimizing a typeface for print is pretty elaborate, and if you're genuinely interested in learning how to do this, https://typedrawers.com is a good place to start. It's where all the font engineers, as well as foundry owners, hang out.

Set your printer to 300 dpi.

No, seriously, when UTCS replaced the 300dpi laser printers with 600dpi models, Allan Emerson was very upset because his papers suddenly looked different. :-)