DaVinci internal filament spool holder

I played around with various spool holder designs to hold filament in my modified DaVinci 1.0 printer. I mostly used corkymork's Thing http://www.thingiverse.com/thing:583800 , but I did run into some terrible spool unwinding problems that caused a royal mess outside the printer and some jammed prints.

What I like about the original DaVinci design is the internal room to hold spools. Apart from a nice guide path that prevents tangling (and the ability to open the printer's cover without kinki