fidget gear ring with inside knurling

Since a variant of my fidget gear rings with knurling on the inside was occasionally requested, I made this one with diamond knurling outside and inside. It is available in 4 ‘odd’ sizes: 15mm, 17mm, 19mm and 21mm inside diameter. The orange/black color combination makes it look somewhat halloween-ish.

Also see my other fidget rings, including a bracelet - because size does matter :)

These rings have tight tolerances, and, depending on printer and filament, 
might work smoothly from the start, 
need some force to loosen up and some breaking in, 
or be fused together and not work at all. 
Silk filament seems to be prone to fusing.

Try reducing the extrusion multiplier (flow ratio) if fused.
 

The second image shows the result of the 5th plate in the 3mf file with low waste of filament by reducing the flush volume to 0 and instead flush into an additional ring, which got some interesting coloring :)

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