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.Print 4 of the ramps, then double sided tape in place in each corner as close as possible to the spool without touching (rotate one full turn to ensure that it doesn't jam). We used 3M high bond tape because we had it...