A friend wanted his own case for the new Samsung Galaxy A33, so I was happy to model and print it for him. After two iterations it was done. He wanted this "beam" ornament.
But you can create your own. In the files you will also find the blank cover, without ornament. Just add your own stl to the slicer and set it as negative volume.
I used PETG, but I hope you can go with TPU as well (I don't have one). Use textured sheet, it looks much better. I didn't use supports, but had to clean up the bridging a bit after printing.
Also check out:
https://www.youtube.com/channel/UChKp-968z1i5PN29gbR7YfA
https://www.cgtrader.com/rorys3d
The author marked this model as their own original creation.