Waiting could be sometime a good thing when designing something.
Like the iRis project I started years ago.
Even if I never posted recent articles about iRis, I did reach a nice stage of development, involving 3D printing design, electronic development and firmware development on different platforms.
The support for the mechanical iris and the servomotor that control it, is important as the electronics.
After many experiments, it was 3D printed a support using Tinkercad.
The purpose of the iRis project is to have a "head" for medical training purpose related to eyes illness.
Basically the idea is to build a "eyes simulator" capable to react to the light like an eye does, in order to simulate different types of illness retina/nerve related.