This ball joint allows a displacement of about 30° from its axis (the 25° is from an earlier version) and can be tightened.

This is DieZopfe's Universal Ball Joint design on thingiverse reuploaded here. They shared this design under the Creative Commons - Attribution - Share Alike license which states that "You are free to… copy and redistribute the material in any medium or format" as long as credit is given, changes are indicated, and it's uploaded under the same license. If you get the file from me and share it, attribute the original creator (DieZopfe).