Here http://wiki.e3d-online.com/wiki/BigBox_Printer_Sub-assemblies#Dual_Extruder Under Dual Extruder it seems to suggest that the Bowden Coupling two parts are assembled together and then fitted to the extruder. (Especially as it suggests the writing is upward. Only the collect has writing on it, and if the body is fitted first then the collect would only install one way anyway. ) But here... http://wiki.e3d-online.com/wiki/BigBox_Printer_main_assemblies:_Step_By_Step_Assembly_Process The parts list says that the body of the Bowden Coupling is "Installed" but that the collet is "in the V6 bag" Which is right and can the WiKi to updated to avoid this confusion? As I have the coupling already fitted, I hope there isn't part of the build that says, Only install the collet after doing this...... as I can't imagine the collect is easy to remove.