Water-cooled hot end
thingiverse
An alternative to the fan cooler on RepRapPro Huxley and Mendel, this water-cooled system consists of a drilled and tapped brass block. After machining, fill the small hole ends with soldered brazing rod and insert 4mm copper tubes. Connect it to a small gear pump or similar using soft 3mm i.d. silicone tube; maintaining coolness requires minimal flow rate. Visit http://reprappro.com for more info.
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