Mintion Beagle camera holder - so it can be mounted on tripod or magical arm. Just remove two small covers and unscrew the old holder. Print this in horizontal position, it will be stronger. No need for supports. I printed mine from PETG. Additionally regular 1/4-20 nut is needed and it can be melted in with soldering iron. Adding grooves on nut will make the joint stronger, it will not slip out easily.
You will need M4x30 bolt too.