Camera Tripod Adapter for Smartphone

thingiverse

This part has 3D printed threads and mounts directly on a universal camera tripod mount. The upper part is to mount a car-phone holder I happened to have laying around. I think it would be a good part to steal and use the lower end, while modifying the upper half to suit your needs. I used .1mm layer height to help form the threaded hole. It worked great, I don't know why all the other tripod mounts use a 1/4-20 nut inserted.