This handy little CNC machined aluminum adapter mounts in any standard RepRap groove mount plate and will adapt to bowden style extruders. It's the same piece used in our EZ Struder for sending the filament into a 4mm PTC fitting. Comes threaded with an M5x.8 thread on one end and a 2mm hole drilled through the part, so you can use one of out 4mm PTC fittings and 1.75mm filament.
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