3d urinary system model

Here is a highly condensed version designed to fit into strict prompt limits. Prompt for 3D AI: Generate a hollow, 3D-printable human urinary system model for fluid flow demonstration. The model must be bisected vertically, leaving a perfectly flat, open back face (intended to be sealed later with a flat glass plate). Ensure a continuous, leak-proof internal cavity. Kidneys: Two top hollow bean shapes. Include open fill-holes at the very top to pour liquid in. Ureters: Hollow tubes flowing from the kidneys, angling down to connect to the bladder. Bladder: Central heart-shaped reservoir. The front exterior must have a slight, convex 3D curve. Include internal holes where ureters empty into it. Base (Urethra): A single tube extending straight down from the bladder, terminating in a wide, flat horizontal baseplate allowing the entire model to stand upright.