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The idea of this design is it, to reduce the length of the bowden hose, because the extruder is attached moveable to the printer. I use this design already for 6 month and I'm very lucky with it. Gear ratio is 6:1 - so you shouldn'd have any problems even with 3mm filament. I don't want to write a big description if no one is interested in it. So if there are any open question, please post them as a comment and I will answer them for everyone. Have fun! EDIT 13.09.2013: Added the STL-File of the bolt.
MM-CNCs moveable bowden extruder
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MM-CNCs moveable bowden extruder
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