This object was made in Tinkercad. https://www.tinkercad.com/things/7q8ei3KPecB
This supports the original non-curved connect bar located at: https://www.myminifactory.com/object/3d-print-nautilus-gears-8691
Here is a video, using the stand to hold the gears in the air, making it easier to demonstrate their spinning: https://youtu.be/Pf5QCR7yPSQ
It attaches very well, and makes it much easier to carry and spin the nautilus gear, especially when demonstrating to others. I am able to spin the gears very quickly and many times, it is like a challenge to see how long I can keep it spinning. I can place the stand on a table or ground and it still holds and spins the gears very well, or I can carry it (using the center hole to insert a finger to grasp better if I need to).
I also found if you rotate the stand where the center hole is facing the ground, so that the gears are vertical -- the gears can spin themselves!