Make me a simple soap dish that I can 3D print for a bathroom sink. It should be one solid piece about 110 mm long, 80 mm wide, and 18 mm tall, with a shallow tray shape and softly rounded corners so a standard bar of soap sits in it comfortably. Add a few drainage slots or openings in the middle so water can run off, and raise the soap slightly above the base so it does not sit in a puddle. Keep the bottom flat and stable on a countertop, and make the shape clean, simple, and easy to clean. Choose any wall thickness or small supporting details needed so it prints well and feels sturdy in everyday use.