UPDATED VERSION: Includes tabs to lock in place
MakerBot has moved to supplying 900gm filament spools that runs against the wiring loom coming up the centre back of the Replicator 2. This isn't a big issue but it does add drag and skews the spool.
This spacer drops into the standard Replicator 2 spool holder to space the 900gm spools back to overcome this issue so it spins freely and stays straight.
Just a spacer so print low resolution, 2 shells and 10% fill. Just drops into the slot in the standard Replicator 2 spool holder to space the 900gm MakerBot spools back so they do not run against the wiring loom.
Refer to the image for additional explanation.