Mmm unfortunately melted plastic doesn't really act as a liquid. It's more of a gooey paste. It wouldn't "flow" like water from a vat. That's why an auger and a massive motor is necessary -- to push the paste through the die. The variety outlined in that recyclebot document actually looks like it might work. I've never tried extruding such a thin filament before so I don't really know the behavior. Might be worth a try?
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