The only thing I can think of is there might be an issue with your printer settings.
The toner is fine seeing how the font type changed not the line weight; it actually printed darker not lighter. When I was trying to fix my line weight issue I was testing both in color, black/white, & grayscale but the text font always changed as shown. If you look at the "Q" and "R" you can see the difference.
Go to printer and select printer properties and under the quality tab lower right will be Font Settings
We ran into this the other day with one of our users where, on screen he saw one font in one style and on the printed paper he saw a different font with different density in the color.
We saw this when he tried to save as a .dwg and then print it.
I don't know if you are saving as .dwg but there may be a place in your printer settings or the options that will do the same thing to print to whatever output type you are doing.
The solution was:
From your SW drawing, click on "Save As".
Select DWG from the pull down for the Save as type:
click on OPTIONS...
be sure you Fonts: is True Type
and your Line Styles is AutoCAD Standard Styles.
This then gave correct font size, style, and density.
If this does not work, try to check you printer configuration settings and making sure they are True Type.
Sorry, I wasn't saving to a DWG file, though I know exactly what you are talking about (I had the same problem a few years back). Glenn was correct it is a printer issue; I didn't notice this before but when I was using Microsoft Word last night I was getting the same problem. Unfortunately I can't find the quality tab that Tony references in his comment. I will give a call to IT since this is no longer a SolidWorks issue and bury this discussion to rest.
Thanks everyone for the help,