Latest AutoCAD version have High Quality PDF print functions. (2400 dpi) which should be best.
However the question is 'how big does your print' have to be?
Print on the largest sheetsize possible from the PDF printer and print/plot the PDF.
You could also try a BMPOUT or PNGOUT to create an image.
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Kind regards,
Edwin Rense
Cadac Group AEC BV
Supporting Consultant AEC
Cadac Group .