Snap together chain fidget

I wanted to do something with snap together parts, and this idea somehow bubbled up.

It turns out to be a wonderful fidget. Fidget wise, I prefer keeping the chain as a line instead of linking it into a circle.

ALERT: For those that keep the chain as a line, I have provided a little end support because the open link on one end tends to get damaged.

I experimented with the teeth on the pin part. At this size, each part length = 2.54 cm, the teeth design works nicely. None of my cha