The nth Spool Holder

Another spool holder for the Replicator 'Dual' and the Creator by CTC (other Makerbot clones as well of course).
Like it was done elsewhere, the spool is not placed on a axle but runs on rolls, for easy and quick changing. For rolls I am using ball bearings (diameter 15 mm, bore 6 mm), which are held by "forks". Per filament roll two holders have to be printed.

There are three versions for either the CTC Creator or the Makerbot Replicator Dual: One where You have to add an axle yourself (6