Serene Funnel for Gravitrax

Rings here : https://www.printables.com/model/1149548-attach-rings-v12-for-swan_kikaku-models

A funnel for Gravitrax that allows the ball to move slowly and smoothly. 
I've been working hard to add more practical entry points, and I'm really happy with how it's turned out.

The entire funnel is held up by three rings attached to tile-like sections. There is no ring structure in the center.
I also created a version with a thin ring at the center, but I realized that supporting the entire funnel with three rings around the periphery is clearly more stable. Additionally, eliminating the groove required for the center ring improves print quality. 
Therefore, I only upload the version without the center ring.

I hope you find "Drop & Randomizer Inlets for Gravitrax V2” useful together.
https://www.printables.com/model/1101342-drop-randomizer-inlets-for-gravitrax-v2

Please make the layer height as small as possible. 
A height of 0.2mm is likely to be insufficient. 0.1mm would be sufficient.
In the video above, I printed with a layer height of 0.08mm. 

It was unexpected to find that much sanding reduced its performance. 
I hypothesize that the circular print paths contribute to the ball's smooth circular motion.

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2024/11/30 Update:
I've made special spacer for this funnel. I don't know it's practical, but I'm sure it looks cool - https://www.printables.com/model/1083774-spider-spacer-for-my-serene-funnel

My models for Gravitrax on Printable : https://www.printables.com/@Swan_Kikaku_714964/models