Santa Claws
Member
It looks very much like the one that was originally designed by @jonco223: Tesla charger adapter holder for Model 3 trunk by jonco223
Apparently, newer Model 3s don'tt have the push pin in the trunk there. But the bracket that it would mount to is still there behind the trunk liner. So, with a little razor work and an extra push-pin you can still mount the holder there. On the thingiverse page above, there's a linked video showing how to do this if you need.
That's the one I link to in the video description.
I've made an extra 3 in white so far. I can make them in Blue, Black or Red. $10 shipped in the US for anyone that wants one. $5 or a coffee for one in person at our future Supercharger meet.