Making dpi darker with my Mac Air

Check the printer documentation and printer settings for whichever printer this is, as a starting point.

If this is limited to specific PDF documents, it would seem those are requesting this display, snd the printer may need to be switched into (for instance) high contrast or monocolor, depending on what the particular printer model offers.

If you want us to look into this, we’ll need to know the printer vendor and model, and whether the printer is being accessed using the printer vendor drivers or (if available with this printer) the AirPrint printing path.

"Making dpi darker with my Mac Air: Some documents have very light font when I print a document. How do I get a standard every time I print something?"

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Increase the Opacity:

Some printers have the option for "opacity", in which case less ink/toner is used for a color (i.e. less red is more pink), as you decrease the opacity. So, see if you need to change the opacity. Find this setting on the screen on the printer, or on the GUI on your commuter.

"Thanks, I have adjusted the printer settings to the darkest setting. Will see if this brings a more legible darker font to all documents"

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You are most welcome.

Let us know the results. Doing so, it would help many, for certain.