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Thank you for the answers.

I have two more comments on the design:

  • The pocket for the bearing of the stand was press-fitting correctly, but it became loose (stand printed in PLA 0.25mm) and now the bearing tend to slide to the point that the big gear rub the flange of the cap, but it cannot fall off.

  • On the very last tooth of the rack and pinion system, I am able to keep the mechanism in a stable position (two teeth facing tip to tip), with the weight at the very top. There is no blocking, a very small amount of force is needed to revive the mechanism since the parts tends to slip very easily, but if the MMU eject the filament exactly at this moment, the rewinder may fail its job. Maybe the rev 1.1 of the gears already solves this issue.