It's a remix from https://www.thingiverse.com/thing:2118833'

5/16 x 18 thread type.

Shortened the male threads and made the point conical to engage with the threads a little easier.

removed threads from the female version to have a little less threads , so you don't have to spend an hour screwing the protector on the cue.

NOTE : i did find with me Ender 3 V3 KS , that printing the female at 101% will cause a little less bind on the threads the original kinda fit too tight and the last thing you want is be at a pool league and it break off.