Hey, I already posted this in the general section, but I figured it belonged here.
I just made a wiki entry on how to prepare nylon trimmer line for extruding here:
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reprap.org]
The pictures only show a little bit of trimmer line, but a whole spool can be dried at once.
Also, I have some extra dried line if anybody wants it. It is 1.7mm diameter, and I will ship it to you for free. I just want to see someone try it out on a working extruder.