Printer problem. My printer will only print halve and sometimes less of a full page of text this

Question

My printer will only print halve and sometimes less of a full page of text this is across the page. I have checked everything that I can think of but still have the same problem. Every now and again it will print the whole page but not very often it is an epson stylus cx3500 .I seem to have most of my problems when in microsoft word. Any help would be appreciated