Update - 2021/01/26: I've added a mini version. It's about 50% smaller than my shorter. It is modified to use a single screw (I used a #6 x 1 in), and includes little wings on the lock nut to make it easier to secure to the wall. The ball also has a Phillips head groove (use PH1) to aid in screwing the ball into the camera.

There are 2 ball stem models:

1. I modified MatsErik's Arlo mount ball stem to include the threaded screw end for securing to a camera without additional parts.

2. The other ball stem is 7mm shorter to reduce the distant a camera sticks out from the wall. The shorter ball stem may slightly reduce the ability to angle the camera parallel against the wall.

I have also shortened the rest of MatsErik's components to reduce the total length of the mount by 17.5mm.

I specifically printed this as a better mount (higher degree of adjustment) for my Ubiquiti Unifi G3 Instant camera, but this could be used for any camera supporting a standard 1/4" tripod mount.