Bowden spool holder for with extruder mount many spools supported

work in progress:

I have been working on a clean way to mount an spool and extruder together. I took the standard printrbot extruder and the bowden adapter that many of you have .. and mocked up a quick wood version. I tapped the whole that supplies the filament to the extruder so I could insert a bowden tube attachment. I really feel that having a small run of hose on the rear side of the extruder helps to negate any kink in the line as it pulls in filament. Here are the key problems I add