If you are trying to print to PDF from your AutoCAD based software and the text or images in the PDF are fuzzy it could be due to the pdf plot driver you are using or that the objects that are fuzzy are OLE objects.
Test different PDF drivers within the plot dialog box. AutoCAD products will have a DWG to PDF driver and then there are other free drivers you can download to test.
DWG to PDF driver - This driver comes with the Autodesk software and should be used.
Adobe PDF driver - This driver is known to have issues with the Autodesk software. If you cannot get a good quality plot using this driver you must try the out of box DWG to PDF driver. If the quality using the out of box driver is of good quality then this is an issue with Adobe not Autodesk.
CutePDF driver - This is a free pdf driver that works well. This is also a driver that can be used with Autodesk software that doesn't have a PDF driver like Revit. http://www.cutepdf.com/Products/CutePDF/writer.asp
PDFLite driver - This is another free driver that is known to be used with Autodesk software. http://www.pdflite.com/
If you have OLE objects in your drawing and those are the objects that are fuzzy change the plot quality by following these steps:
change the OLE Plot Quality = Monochrome
- Verify the system variable OLEFRAME is set to 0 (zero)
- Select the OLE object
- Right click & select Properties to open the properties palette
- Under the “Misc” Section in the properties palette, Click the ‘Plot Quality” section and select either “Low Graphics” or “Monochrome” from the list.