My quick 2 cents, some of which agrees with the info above.

I don't worry about DPI when rendering. DPI is just header information in the image file which can be changed at any time after rendering and/or post-work. There is zero pixel difference in a single render that has either 72dpi or 300dpi applied to it.

I myself use either my Thumbsplus or Irfanview to make sure/change the DPI to 300 before doing a final save which would go out to the print company.

300 DPI is the basic standard, but as Connie mentioned, I too have changed the DPI to 150 and printed with success (on my home printer).

 

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