Bought a WeVibe Bond and discovered it's really not made for all sizes. It does come with an expander link to add a couple of millimeters, but that's not nearly enough.
So I made this model in Fusion 360. It's has parameters, so you can adjust it in various ways, but probably all you need is new_circumference
. Just measure a snug but not too tight fit.
Of course, this should be printed with a body safe material, and should be sanded down to a smooth finish. You want to avoid buildup of bacteria.
I used superglue to glue the two parts together.
WeVibe, if you don't like this existing, please add a variety of sizes of links to the toy's packaging (and send me one) and I'll happily take this down.
The author hasn't provided the model origin yet.