Tested and works with Blender version 2.79b
Adapted large print plugin for Blender to suit my needs.
I've no idea if this has been updated and looked after since it worked w/ Blender 2.54, but I find it fairly useful for quick poster rendering. I've tweaked it so it can render 36x28 in @ 300dpi. Good for printing posters.
The plugin was originally called: Render to Print http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Render/Render_to_Print