Prusa i2 Bowden extruder mount

You'll need two of this. Compatible with my own direct drive extruder (http://www.thingiverse.com/thing:859583), Airtripper BSP v3 extruder (http://www.thingiverse.com/thing:126778), modified Airtripper BSP v3 extruder for flexible filament(http://www.thingiverse.com/thing:859583) Geared Extruder by terenceang (http://www.thingiverse.com/thing:456095) and all similar.