I designed a spiky fidget roller for my wife's workplace as a sensory stress reliever. It's intended to be rolled in your hands to help reduce stress and provide tactile stimulation.

The roller measures 2.5 cm in diameter and 10 cm in height (approximately 1 inch in diameter and 4 inches in height).

The model prints well at a 0.3 mm layer height without any issues.

If you want the rolle to have a larger diameter, you can simply change it in your slicer by disabling the uniform lock and only adjusting the X and Y axes to the desired diameter.