Summary

My first try to design an iris mechanism

Instructions

You need to print the cam ring, the lower housing ,12 blades and 12 pins.
I printed the blades with only one 0.3mm thick layer. That can be a bit tricky but the blades need to be very thin.
To assemble it glue the pins onto the small holes in the blades on the opposite side of the pins that are already printed on. Then put the blades in the lower housing and the cam ring on top.
This is a work-in-progress so the cam ring might not fit perfectly and the whole mechanism is also not that solid. Feel free to make improvements to it and please tell me about it

fully printable Stargate inspired Iris