There are 5 blades and 5 external gears (they are the same size). The hole diameter is 23mm; the external diameter is 64mm; Height is 7.7 mm.Suggest printing the parts with resin material. After 3d printing the 3d models, you need to use M3 screws and diameter 1 mm pins (length 4mm) to assemble parts together. Due to the 3d printing accuracy, maybe you need to file some parts a bit before assembly.There are two ways to open/close the blades-rotate the ring gear or rotate the driving gear with a tool. Ignore the FBX and OBJ format files, they are only used to meet cgtrader's requirement.If you want a customize iris diaphragm or have any concerns, please contact me, I will try my best to help you. And I provide 3d design service too.You can download free 3D PDF file here: https://www.tanerxun.com/mechanical-iris-shutter-mechanism/.html