Iris mechanism glasses out of paper and string.
The attached PDFs are for 11x17 printing, outline of pieces are included to cut out with dimension to scale.
If you have access to a laser cutter there is a dxf ver attached as well.
Get your geek on.
paper glue (i used soba brand)
string - thats thin and strong ( i used book binding string)
Bristol paper- 100lb
hole punch -or something that punches 1/8 in holes or less
Mailing tube - 2 15/16" inner diameter (got mine at fedex)
heavy chipboard/cardstock (mine was 1/32 thick )