Iphone passive speaker dock

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/l4zAMtSXfP6

I copied the base design from somewhere, but can't find it again to thank the person who designed the original. If it's yours - thanks.

All I've changed is to make the inside hollow, and added two bulbous protrusions at the back. I thought they'd make the sound bigger.