Print it in Ninjaflex at 70mm/s with the Flexion Extruder

This material isn't as soft as the typical cause bracelet, but if you size it right...or if you have a strong-man stretch it for you, it will work:) The material is available here:
http://www.fennerdrives.com/3D
Video:
http://www.youtube.com/watch?v=EpkvHo6a888