Hello, I made this joint because I bought the Goku ui from black hole toys and when I tried to change his hand I broke the joint, so I started to model the joint and print it in fdm and it works quite well.Both the wrist joint and the neck joint are the same joint with the difference that the neck joint is a little longer.

If you are going to print it in fdm, I recommend forcing the fit of the two pieces with a clamp and if it does not move or is very tight, you can heat water, leave it for 20 seconds and take it out to loosen it, then you can move it, I have not printed it yet in resin so I don't know how it would go.