Pixelated Patches When Printing to PDF
I'm using Illustrator CS6 and Windows 10. When printing a large drawing to the Adobe PDF printer, seemingly random patches of the drawing wind up pixilated, shown in the small excerpt below. However, if I divide the drawing into four artboards, I can print each of the four without any pixilation. That makes me suspect the drawing is simply too large to print correctly. The .ai file is 19mB (saved with compression and without PDF compatibility, or 55mB with compression and with PDF compatibility).
Any thoughts?

