Solar spinner

thingiverse

A playful spring spinner features balls measuring 15mm in diameter. Additionally, a 1/2-inch (12.7mm) version is available, though untested and boasting a different spiral design. By adjusting parameters within the OpenSCAD file, numerous other spiral spinners can be generated. The caps securely hold bearings in place without needing glue for retention. Update: A revised version has been uploaded.