The file 'Mechanical Iris Shutter 3D Printer Model' is (stl,f3d) file type, size is 1.4MB.
Mechanical iris shutter.It's a toy/fidget ;)
DimensionsTotal diameter: 90 mmInside diameter: 50 mmHeight: 9,6 mm
Aperture:
Open : 50mmClosed: 2 mm
https://youtu.be/Fa9i7rhVRKw