Handle mounted door stopper made of TPU plastic.
I printed with a properly dried Sainsmart translucent TPU on X1C with Generic TPU profile (not modified).
To achieve a smooth surface used Coolplate with the Bambu liquid glue.
Supports round handles with thickness from 15 to 20mm (20mm as in the photo) - otherwise feel free to scale it.
The bevels on the inner fins are there to help with fitting.