I've seen some of your work. It's really great stuff. That's a big printer you're talking about to do it all at once in 15" sections. Probably about $300 at the cheapest. But you could also print in smaller sections (up to 10") which means that what you're describing could be done on the lowest end printers. Materials wise, one roll of PLA should be plenty and goes for about $15-20
Hey, I give you a lot of credit for one of the few building EDF planes out of PLA. ? for you, How do you determine the overall weight(components as well as electronics /EDF/battery) for where to put the wing saddle to get CG right?