Some customers told me that after importing/linking .dwg with .shx fonts into Revit Structure and when printing some of those .shx fonts will be plotted very thin or gray. It's important to know that Revit Structure supports only TrueType fonts. However, there is a way to map .shx font to your desired TrueType font.
Here are the steps (from Revit Structure Help):
"Revit Structure 2008 User's Guide > Interoperability > Import/Link > Importing or Linking CAD Formats > Mapping AutoCAD 2008 SHX Fonts to TrueType Fonts
When you import AutoCAD 2008 drawings that contain text, you can map the AutoCAD 2008 SHX fonts to TrueType fonts so they appear correctly in Revit Structure. You can map to any of your existing fonts.
NOTE: For SHX fonts that are not mapped, Revit Structure will use a similar font, but the results are unpredictable.
To map TrueType fonts:
Open the shxfontmap.txt file in a text editor ex. Notepad. This file resides in the "Data" folder of the Revit Structure installation directory (Figure 1).
Enter the SHX file name and the font to map it to, using the following format:
filename.shx<tab>fontname (Figure 2).
Save and close the file.
Note: You do not need to restart Revit Structure for the font mapping to take effect. If you have already imported the file, you will need to import it again."