|If only one could make a living by making random things that serve no purpose.|
Make it bigger.
One of the reasons that the first iris worked so well is that it's parts were bigger (radius 10") so slight errors in the alignment of the pins affected the overall performance less. With the miniature iris, (radius 4") the best I could do for pins was an assortment of machine screws which leave quite a bit of wiggle room so the parts can misalign themselves and piss me off when I try to use it.
Find better quality wood.
I cut this out of 3/16" luan, which is synonymous with crappy plywood. Every piece of luan that I've come across has been slightly bowed. Laser cutters don't like it when materials are out of the beam's focus, and so in order to inform you of this fact, they leave large scorch marks on the top of your object, and the width of the cut increases greatly.
Make some sort of handle.
As impractical as this thing is, when I do decide to fool around with it, it's tough to hang on to and requires two sizable man-hands to operate smoothly.