Man, that would be a lot easier than printing these things out.
This photo isn't particularly realistic or pretty but demonstrative of the benefit of using a ray traced renderer when previewing the products. This particular product's purpose is basically collimating the light path to an exact rectangle shape and size while blocking or mildly reflecting it elsewhere. Basically a barn door style spot light but compact, unadjustable and with almost no light leaks. This is used for illuminating only a single section of a saltwater aquarium filter to grow algae for bio-filtration and making sure the light isn't bleeding into other compartments. It is shaped to fit a custom setup but with a render pipeline in place it can now be re-rendered with any other customized versions in the future. This was not the first custom light shade and it won't be the last.
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