SeeMeCNC is presenting their 15 feet (4,5 meter) tall Delta 3d printer named "PartDaddy" at MakerFaire Detroit. It will have a changeable 6,35mm or 7,25mm printing nozzle which will be fed by pellets. They have planed for it to bepropane powered but they gave it up for safety reasons.
It will be interesting to if such big FDM printers will find a market niche.
Details about PartDaddy are on SeeMeCNC forum:
http://forum.seemecnc.com/viewtopic.php?f=61&t=2508
https://www.facebook.com/seemecnc
http://seemecnc.com/
They are just a little taller then the Japanese Genkei Delta:
http://diy3dprinting.blogspot.com/2014/07/genkei-gigantic-4-meter-tall-delta-3d.html