What you get will be digital files, including PDF, DWG, STEP, 3DPDF formats. What you get is not a physical product. But you can manufacture this products with these files.

Parts are designed towards to manufacturing purpose, you can manufacture these parts with CNC routers, and the functional unit can be used on industrial products. If you plan to 3d print these parts, I cannot ensure the mechanism will work well, because it is NOT designed for 3d printing.

The whole mechanism can be used as a functional unit. When you rotate the “Drive Gear”, the blades in the center hole open or close gradually. It is similar to a camera aperture or iris diaphragm. A motor can be used to drive the mechanism.

If you want to know more about the mechanism, read this article: https://www.tanerxun.com/mechanical-shutter-design-plan/.html

Ignore the FBX and OBJ format files, they are only used to meet the platform’s requirement.