About this 3D model

This object was made in Tinkercad. https://www.tinkercad.com/things/bGdYfXXbSSj Spinner, using marbles as a bearing. The center hub can be resized or sanded to improve overal fit. On mine, I sanded the hub (the points on the inside) to make it shorter so that the curves would help push the marbles out to the outer ring. The ring is set for 5 marbles at 16.4mm which is a bit sloppy but guarantees a good print even if the extruder leaves strings or bubbles.