I had a ball joint phone holder laying around, and wanted to mount it to a tripod, so i designed this.

It should work with any tripod that uses ¼'' thread, with an optional locator pin.

The sphere is 17mm in diameter, which worked perfectly for my case, but i attached the freecad files if you want to change the sphere dimension.

Recommend printing in PETG, 4 walls, 15% gyroid infill