This particular project uses a laser cutter to make the iris out of Baltic Birch, and it is based on a ShopBot CNC Router article by Chris Schaie that has extensive details for constructing an iris. He imports the DXF into Corel Draw and uses the latter to scale to size for his material:
As you can see, it’s a very nesting-intensive sort of project if you want to get full use of your material. It’d be a good project for a waterjet cutter too if you’re making it out of something besides wood. Between the Lepton and ShopBot posts, there’s plenty of information available should you wish to build your own iris.
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