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That would be very nice indeed. Currently I'm using a compact bowden extruder (also here on thingiverse) with bowden fittings on both sides of the feeded. I love that setup as it will prevent wear on the filament en extruder from filament touching the entry hole. Unfortunately though I'm not too satisfied about the compact bowden extruder as it designs allows the idler arm to twist, which seems to worsen over time.