Here is a huge Delta bot 3d printer, thougt it might be of interest to some. :cool: :D
https://plus.google.com/u/0/photos/+SteveGraber/albums/6054479016196362321
https://groups.google.com/forum/#!topic/deltabot/fsBaK9ZzLi0

Cool stuff!  Hey Russ, remember talking about something like this:   Looks like it's been done! :cool:

sweet. tahts not to bad.  allows it to be free. how is it attached? if its still attached to the arms i guess it would work as it is still free to move slower and not at the fast rate that the head is moving...

hummm.. ill look in to the kinda room it takes to make that work. i like it for better print quality. retract and such of the filament.

~Russ

Yes some are doing smaller versions of this on a Kossel delta build.