Spool ramp

A while ago we made the Makerbot Deluxe Filament Spindle MK1 ( http://www.thingiverse.com/thing:3116 ), and noticed immediately that the full filament roll would drop down over the sides, and either jam the spool, or loop around the shaft under the spool making it hard to feed.
A quick trip to the cad machine and 4 prints later, and all the filament stays where it is supposed to be. We haven't looked back.