Sharpie Rainbow Tiki
Are you using (this)[http://www.thingiverse.com/thing:77424http://www.thingiverse.com/thi...] to color your filament? Have you got an easier method?
we hand color it - sometimes we mark up the open surface of a spool, other times color it just prior to going into extruder. i like the idea behind this thing - but i worry it's putting down too much pigment and that the markers are going to dry out too quickly.