Makerbot Low friction spool holder for glass marbles, prints wit

Makerbot Low friction spool holder that is great for flexible filament, with this design you do not risk stretching the filament and will not get low feed rate in the extruder. This version prints 1 part with support and 4 parts without support. I developed this holder to be used with my own TPU filament. http://rubber3dprinting.com/