Replacement Seal for IKEA Atlant sink plug/strainer

The original seal for my IKEA Atlant kitchen sink plug broke - it wouldn't stay open any more due to the corners of the little standoffs being rubbed off by years of usage. As there where only a few clunky 3d models available online i decided to design my own version that prints without support structures.

Printing Red TPU with a high shore hardness was used to print the part you see in the pictures.

Feedback I would like to get your feedback on the part:

Does this part work for you? What kind of material did you use (TPU, TPE, …) and which shore hardness does it have? Are there any improvements to the model you would suggest?