I had to design a soap dish using CAD for class. I wanted something cute for my owl-themed bathroom. So I made a two-piece soap dish. It is 5.5" L x 4" W x 1" H. The removable tray has an owl cutout to allow for drainage. The upper tray has a bit of an inner bevel to move water to the bottom. The tray is held up by four rounded shelves inside the bottom tray. There is a small gap between the tray and bottom, to make it easier to fit the two together. This prints as two separate pieces. The original bottom has a curved base that may need supports to print. I have also added a flat base if you would prefer.

Planning a test print shortly and will update as needed.

I designed it in Tinkercad. Feel free to remix it in any way you like.
https://www.tinkercad.com/things/cPUiLY5meJx