The feel of smooth layered PLA combined with a contoured rubbing surface creates a satisfying toy to rub and keep your hands busy while improving focus.
Outline/Perimeter Shells: 3
Outline Direction: Inside Out
Raft is required because bottom surface is rounded and has trouble sticking otherwise, although this may be untrue depending on your bed material.
If your slicer supports it, have the layer start points all the way to the left or right of the print to keep the layer "seam" outside of the rubbing area. Ex: X-0; Y-100 for a printer with a 200mm^2 print area. This keeps the part as smooth as possible and makes it significantly more satisfying to fidget with.
Additionally, if your slicer has a setting to avoid crossing outline for travel movements I would suggest enabling it to prevent bumps caused by stringing.