This is a hook for a tube towel radiator with a tube diameter of 22,5 mm and a tube distance of 31 mm. It was inspired by several other designs here, unfortunaltely none of them fit this radiator so I created a new one.
It snaps onto the tubes nicely and you do not rip it off when you grab the towel.

Prusa

Mk2.5s

No

No

0.2

30%

It was mainly inspired by innercube's thing https://www.thingiverse.com/thing:4662018