Microscope lens covers for for 33mm and 27mm diameter eye pieces. STLs are listed as other models in my account. The hinge is made from a piece of pla superglued into the hole, the clamp is the right length for an M3x12mm screw and has a recess for a nut. There is an eye of Horus inlaid into the inside of the lid, which was taken from https://commons.wikimedia.org/wiki/File:Eye_of_Horus_bw.svg. There are pictures on thingiverse https://www.thingiverse.com/thing:4870011