T800 eye with dilating pupil powered by a 2g micro servo: https://www.aliexpress.com/item/1005002973104855.html

It's still a work in progress and fiddly to assemble, especially the aperture blades.

Lens and diffuser should be printed in clear or translucent plastic, the blades ideally in PLA or PETG if your printer can handle it. A 3mm LED is mounted in the opening on the bottom. Ideally the top of the LED should be sanded flat.

The aperture blades comes in 2 parts, the small nub should be glued onto the opposite side and end of the existing pin. If you plan on resin printing them use the Aperture_blade_merged.stl.

11 blades per eye required.