mostly 3de printable air pump

I recently purchased a reel of Ultimaker TPU95A filament for experimenting as this filament is advertised as both durable and flexible and I was looking for a filament with these features to 3D print the gaskets, valves and bellow of an air pump design I'd been working on as part of an upcoming project.During testing of my air pump design, I determined the valves and gaskets worked great, however the 3D printed bellow required more energy to compress than I was willing to accept in the upcoming project, so it was back to the drawing board, or better yet as I accidentally discovered, the kitchen...My wife Lora loves to bake and last weekend she was in the kitchen with the grandkids baking one of their favorite snacks, cake balls. As I casually strolled by, I just happened to notice she was baking the cake balls in "silicone baking molds", and as I so keenly observed (at my age, that is a stretch), one of the baking molds had hemispheres that were the exact diameter and thick