There are a couple of reasons I went with RichRap's geared extruder. First, I was concerned that the direct-drive extruder wouldn't have enough force to push the filament through the Bowden tube. And second, I already had a hobbed bolt from my Printrbot Simple V1 (they switched to direct drive in V2). Let me know if the direct drive works, as I took it on faith that it would have problems rather than testing it myself.
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