belly piston <hollow

thingiverse

The human's body was a complex machine, comprising numerous organs that worked together in harmony to maintain its overall function. The stomach, specifically, acted as a muscular sac that churned and mixed food with digestive enzymes, much like the pistons of an engine pumping fuel through its cylinders. In this way, the stomach could be likened to a hollow piston, driven by muscular contractions that propelled the mixture towards the small intestine for further digestion.