I usually render @ 1024x768 72 dpi, which seems to give good results when printed on A4 paper. I print the file directly without dropping it into a paint package, and let my printer take care of its own printing resolution (it defaults to 300 dpi). I guess you could up the render to the same if you're really fussy about the output quality. I'd also recommend 100 gram paper at over standard letter paper (which is 80 gram).

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