All nylon diff. (Except for The screws of course)
I can not add new post, so i had a comment here about new material than coul help a lot for this project i guess : http://www.3ders.org/articles/20140326-igus-introduces-world-first-tribo-plastic-filament-for-3d-printers.html
@Daniel_Noree what slicing software do you use?
@Mark_Oates Makerware