Couldn't get this to print without adding supports for both the internal threads and outside. I also tweaked the designed supports slightly (up 0.05mm if I recall correctly as they didn't appear to be centered) and added top surface ironing to make removing those easier.
In the end it works, although it's tight and the snap ring isn't as springy as the real thing.
Printed in PETG on Creality K1 Max. Maybe needed to slow down overhangs even more.
Hardest part of production will be to get 2 scrunchies from my girl.
Print came out very nice, used Prusament PETG.