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Fantastic! I've been using this extruder to print carbon-fiber-reinforced PLA (from http://www.proto-pasta.com/), which is highly experimental right now. Carbon fiber PLA is brittle and stiff in filament form, which makes extrusion a nightmare (broken filament, stripping, skipping, jamming) unless you have a setup like this. I actually printed this extruder block using the carbon fiber PLA. Performs flawlessly. Many thanks!