Single-Size Pinhole Camera Diaphragm - 3D Printed

I’m starting a scratch-built pinhole camera and the first milestone is the diaphragm. I need a simple blade that can flip from fully closed to fully open by means of a small mechanical lever.. The part must be fabricated in plastic so it’s lightweight yet rigid. It has to be absolutely light-tight when closed.

Please quote a price for a working diaphragm. Once it is completed to satisfaction we will work on the camera itself. I already have suitable images of it but not files for 3D printers.

Thank you.