ColorFabSpool Holder

I use this on my colorfab spools as replacement for 608 bearing and my spool holder, so internal diameter is 8mm the same as 609 bearing and outside diameter suits the colorfab spools. I normally print these bearing to 0.1mm tolerances so may need a little bit of persuasion to make it work when finished printing.

Customized version of http://www.thingiverse.com/thing:72069

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