Now you have three problems, not only do you need an expert on glass technology in general, and an expert on the weird glass requirements specific to the obscur

Now you have three problems, not only do you need an expert on glass technology in general, and an expert on the weird glass requirements specific to the obscure specific problem, but now the unicorn employee needs to be an expert on 3d printing technology. Which for a guy who mastered glass technology probably isn't going to be very hard to figure out, but still, making it even harder to find a guy isn't going to help.