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I’m re-posting a forum post from http://forums.reprap.org/read.php?1,205005,205005 It extrudes ABS plastic re-purposed from refrigerators doors. The author says he has last then $100 in costs and it produces a working filament. Xabbax wrote: “Low cost filament extruder made from 10 mm ID stainless steel tube, silver soldered inside an ordinary plumber 15 mm copper tube…