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thank you for your feedback and the kind comment.

Yes....it is 0.45mm. The shaft is 7.85mm (to achieve a good fit to the 608 bearing) and the ID of the small gear is 8.3mm. This was originally 8.1mm, but the fit was too tight on my prints, so I enlarged it. For me, this is still a tight press fit, but can be done with my hands.

Let me print another set and verify I have not made some mistake between printing my units and exporting the .stl files for thingiverse.

Does the shaft of you large gear fit the bearing well?

I will look into a detachable high arm which would allow taking filament from the top of the roll on the opposite side. BTW, filament removal must always spin the spool in the same direction regardless of where the festo fitting is located. The gear and weight system is not bi-directional.