This is an upgraded version of my Octo-box iris box. This version now uses screws instead of 3D printed holes and pins, making printing and assembly much more straightforward. Using screws has also allowed me to improve the mechanism, such that it produces a smooth octagonal aperture when fully opened. To open the box, you push the cutaway handles in an anti-clockwise direction. No supports are required for the parts.
I have made many of these boxes as unique gifts in many different variations and sizes as shown in the pictures.
The box (unscaled) is 80mm overall in diameter, has a 64mm wide container opening and is around 80mm tall. The part files are designed for M2x6 countersunk screws such as these (40 in total) for the mechanism although the parts can be scaled to use larger or smaller screws. The larger printed examples are at 150% scale and uses M3x8 screws while the smaller examples are at 100% scale and use M2x6 screws. Note: it's a lot cheaper to buy the screws in bulk from an online specialist supplier in your region.
To test the screwed joints, I have included test files 'Screw test pt1' and 'screw test pt2' (both are required). If you need to scale the test files for your particular screws to work, then you will need to scale all the box parts by the same amount.
For the box you will need 8x 'Top' parts (any mix of 'Top' parts can be used but I recommend they are positioned in pairs across the box), 8x 'Bottom door', 8x 'Link' and 1x 'Container'.
There are two versions of the iris parts. The basic versions are plain flat parts while the others are embossed decorated versions (used on the larger examples) and are designated with '(dec)' at the end. There is also a shortened version of the container 'Short Container' (used on the smaller examples), which reduces the height of the box from about 80mm to 40mm.
The 'Top handle' parts allow you to open the box by gripping a pair and turning anticlockwise. The 'Top door' and 'Top handle' parts can be assembled as you like on the top of the box although I recommend you position them in pairs (e.g. the smaller printed examples use 2, 4 and 8 handle parts).
The assembly is quite straightforward although be sure that the pointed ends on the links are connected to the bottom of the iris and not the container, otherwise the box mechanism won't work.