These are three simple extender bats with ¼" UNC sockets/threads on them to allow you to extend up from the grip on a tripod. They fit into each other if you need to get variations on that height. 

I've printed them using a 0.6mm nozzle and a brim for the taller two. 

Please be cautious before trusting them with expensive camera gear, they are fine for light things, but please don't smash your expensive bodies/lenses be creating ridiculously tall towers that will shear on layer lines.

That said, they have worked well at the 200mm height for both my iPhone and OSBOT webcam with a gorilla tripod.