There are 3 versions, in three components, a hook (v1, v2, v3), a ring (v1, v2) and a stick to attach the ring to the hook.
V1: Ring v1 + hook v1: sturdy and simple, but planter is not leveled and the weight is no well ditributed (but works anyway)
V2: Ring v2 + hook v2: IMHO, visually, the best, but I broke a little the prototype when I inserted the ring in the hook, so, it's not thicky as I want. If you sand the pieces and are a bit more patient than me, it works! (Actually, I blamed the PETG, blamed my humble printer and I glued a bit the ensamble, and… it worked). Anyway this version adds better weight distribution and the planter keeps leveled.
V3: Ring v2 + hook v3: It's the same than v2, but I make the ensamble hole in the hook .4 mm larger and remove a decorative hole in the hook body to make it thicker again.
I printed it in PETG to make it resistance to sun and summer.
The author hasn't provided the model origin yet.