In our third video we are going to start looking at Mechanical Iris designs with overlapping blades. The type we will model in this video is probably the easiest one to understand but it will not close entirely. There are loads of variations of this design and we will focus on just the mechanics of it. If you want to make your own for 3d printing you will need to figure out how you want to hold everything together.

The version I 3d printed for the video can be found here, but could use a bit more work for better retention features or more space depending on how thick you plan to make your blades.
https://a360.co/4eAUazx