A simple ball and socket mount for the modular mounting system. This one can be screwed down using the three screw tabs on the socket.

I designed the threads on the socket and cap to be more printable. So the angle is only 30 degrees, which should be easily manageable without any supports. The standard 60 degree thread angle is a bit steep for some materials, so the 30 degree angle is easier to get to work.

You should be able to print it without any supports!

This should work well with any modular mounting parts, but I like these arms and knobs! https://www.thingiverse.com/thing:3689842/files