Brian,
This depends as much on your operating system as the browser you're using (Internet Explorer – eghhh….., Firefox, Chrome?)
Perhaps first selecting the areas you wish to print will help you get what you want, while saving ink and paper too;
Find the end of the bit you want to print, left click hold and drag up the article to the start of the bit you want, let go of the left and then single right click and print, you should now just get the posts and headers selected
(I find this direction of selecting more controllable than going top to bottom!)
If it then tries to print this in the same odd way It's likely the printer preferences which could be specific to the printer your using or managed by the operating system (Windows?) depending on your setup.
Edited By Russ B on 05/08/2014 12:13:43