This is a remix of parnathians' model on Thingiverse found here https://www.thingiverse.com/thing:4384918

I wanted it shorter and with grip; I also hollowed it out a but to reduce material and time.

Make sure to pick the proper file for which plastic you have; The "Rigid" version is for plastics like PLA that have no give to them. You may need to sand the inside after if it is still too tight (I redid it to be slightly larger to avoid this issue)