I've had the same problem with some other sites, not yet on PF though. Maybe because I don't print much from here.
I just printed the same Insight and got a layout with the sidebar, and consequentially grossly different page breaks. There were words and/or lines dropped at the bottom of at least some of the pages. A possible problem is that the "Physics Forums Insights" header is placed at the top of pages 2 thru n and gets the pagination software confused. This also shows as the first line of text missing at the top of the page.
I downloaded the Insight and printed it locally with the same results.
I also tried replacing the "Insights" banner file with an empty file and obtained similar but
not identical results. The Banner was replaced with the letters "P" and half of the letter "h", blank space and a blank line, and a demarcation line. Something in a .CSS file somewhere?
Also, the end of the Insight has duplicated entries for "Newer Comments >>"
I also tried to print
selected text and it would not print, it never even got to the print spooler,
So,
@jim hardy, it's not just you with a problem; this Insight seems really messed up.
EDIT: Also the associated files for this Insight included an image of a car! No car appears in the article itself.