There's not a good way to do this. If there was, you would have family trees that would be dozens of feet across. I don't know just what you want to print, but in my experience, the best way to do this is to print out seperate ancestor charts (maybe two) and descendent charts. And you might decide you're better off doing your printing from something other than Family Echo.
There are companies that will print out your family tree for you from your GEDCOM file. This resource lists a few of them toward the bottom of the page. Note that your GEDCOM file doesn't include pictures.
I actually purchased Family Tree Maker just to use their charts. I work in FamilyEcho and then export my GEDCOM file and import it into Family Tree Maker. They have an option where you can print out your whole family tree (subject to the normal limit of how much of a tree you can realistically display at a time) as one large PDF (instead of splitting it into multiple pages. But there is a hard limit with PDFs of a maximum width of 200 inches (about 17 feet), so there are some compromises there as well.
After I had my 3 feet by 17 feet pdf file, I had to find someone to print it for me. If you go this route, I found that blueprintsprinting.com was pretty reasonable at about $45.00. Office Depot and places like that can print that large as well, but they wanted much more money. After it came, I took shipping tape and taped the backside of the family tree so it couldn't rip. I might laminate it eventually, but I figured people would point out errors in this first one.
