A simple 1" RAM compatible ball mount intended to have a m4x35 flat head machine screw through it for strength then using moulding "trim" tape, attached to whatever surface you might want.

SO I printed this in PETG. Very good material for such a thing. Great layer adhesion. diminishes the potential for sheer. I have been using it without bolt reinforcement.
With my cheapo/quick design, but.. it makes a harder print. I suggest adding your own supports beneath the ball, printing with base down. Slic3r does not do a good job making supports... and many/most people don't use S3D. THen again, if I was printing in PLA it would print without support. It printed fine without support, but for a slight tear drop shape. Used parts are spherical.