This is a shampoo rinse cup for use in baths for kids, so that you can lather up their hair, dip the cup in water, and place the curved part on their foreheads and poor water over their head while minimizing the chance of getting water (or more painfully, shampoo) in their eyes.
The pictured version with printed in PLA without supports and holds quite a bit of water.
There are 2-handle and 1-handle files; the two-handle files have handles on either outer edge, with the 1-handle file being one handle in the middle. Which one you use will depend on the orientation you'll need for your bath (presuming you're using this as a parent) if you are likely to pour from their side or head-on.
The two-handle version is also intended for child-use, making it easy for them to hold - I know my daughter loves playing in the water, so the one I've printed is purely going to be a toy for her.
Critically acclaimed as “Wow! Fan-tas-tic!” by all prototype-reviewers.
The author marked this model as their own original creation.