A transparent sealed container is needed to hold the reel and descant, I purchased mine from KMart , its just a little bigger than my biggest spool with some space left over on the side for the descant. (approx 210x120x280 mm)
The reel is placed onto the spacer rod and held with the retainer, some tape around the shaft of the retainer can create a tight fit. the reel should easily spin on the spacer rod.
The reel assembly is screwed to the inside of the container with the screws passing through the floor of the container into the reel hanger. Make sure your biggest reel has room to fit and rotated freely and that the dovetail of the reel hanger is free to accept the Reel mount v block.
An 8 mm hole is drilled into the corner of the container to fit the feed unit, this is screwed to the feed bottom. The plug can be used to retain the filament and block the feed tube for storage, remove when using.
Reel mount v block is screwed to the back of your replicator 2 using the reel mount plate and the existing reel mounting hole.
The spacer (print two) is used to center thin reels like makerbot filament.
You may need to created custom reel spacers to suit the many sized filament reel holes.
Bilby http://www.bilbycnc.com.au/ generic filament don't need spacers (has the smallest holes),
ReelRodSpacer.stl is to suit makerbot reels
ReelRodSpacerSain.stl Spacer for www.sainsmart.com reels is now available.
also not yet included is a means to retain the descant (from Bunnings) to prevent it jamming the reel (not happened yet) a hook to hold the desiccant has been uploaded but not tested yet.