I made this to hold the Creality PETG refills made for the Bambu Lab refillable spool holders.
I used the thumb screw heads for the bolts that I have on my profile for this to make assembly and disassembly easier, but you could just use a normal 1/4-20 bolt.
I do recommend getting a cheap 1/4-20 tap off of amazon to clean out the threaded holes in the model. Not necessary, but it will make the bolts thread in a lot easier.