The idea was to try to make a rolling diaphragm the easiest way I could think of and see what happens. Since it needs to be flexible, I decided to make the first out of silicone rubber. I used the housing itself as part of the mold and 3D printed a few more parts to act as the rest of the mold.

It didn't turn out too bad but I think I will try another way next time and not using the housing as a part of the mold because I had a really hard time removing the piece!