TLDR: print upright with organic supports.  Uses a standard paint roller extension handle from your local hardware store.

This print serves to literally scratch an itch I had - existing back scratchers weren't robust enough, or had too few points and dug in instead of scratching.  Thrown together from various OpenSCAD modules I had, some mine, some modified from others.  I designed it to use a standard wooden extension handle in my paint supply closet.

While this print won't print without supports, only a small amount of organic supports around the bottom are needed, and they peel off easily.

To regenerate with OpenSCAD, I've included the modules I've written or modified, but you'll need to download the thread module separately (url in the sources).