This one has not been tested yet but is using the same design as the 14mm which has been tested.
I made this 12.4mm inside.
Tolerances are 0.2mm so print this first- https://www.thingiverse.com/thing:3569489
More sizes to come. I originally made 8mm and 10mm but was asked to design some sizes up to 14mm ;D
Utilizing print in place one-way bearings. No support needed.
If you have any issues printing please let me know, feedback is key to better designs ;)
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Thanks for stopping by, come back soon ;)