how can I print just a part of the page and not the full page with Adobe Reader v 10.1.2? I need to print a engineering print with lot of information but information is too small in letter size and I don't have a plotter.
I don't think you can do that with Adobe Reader.
What I would do if I needed the same is convert the PDF to another format (Word doc or image; search Google for a free conversion tool), then eliminate the information I don't want.
Two ways to print a portion of a page: zooming or using the Snapshot Tool.
Hope this helps!