It's a Shower Sponge Holder.
It clips onto your shower riser rail and you slot the sponge into it. Water drains from the sponge straight to the shower tray which means it doesn't sit in the water on a shelve somewhere and doesn't get manky.
If , like me, you have a rain head and the pipe that goes to it has a little connecting bit , you can use the same size of a holder as the thickness of a pipe. Just slot the connector in a gap in a print and it'll spin on a rail freely but not come down. If you don't have it, use a holder with a smaller diameter than the pipe's diameter for a nice tight snap fit
Print as is (orientation) and with supports
If you need a diameter not included here just let me know! Enjoy!
How it works: https://youtube.com/shorts/QNLJSocNAhY?si=YD3IdZVt5IZWDs-U
The author marked this model as their own original creation.