Someone built precise lab equipment using a Raspberry Pi and Lego
There probably isn't a Lego kit for it, though.

I'm starting to think there's a holy trifecta amongst DIY enthusiasts, including 3D printers, SBCs, and Lego. We've seen projects that take two of these components and mash them together into something cool, although I'd love to see one where all three are used at the same time. Until then, we have this excellent Michelson-Morley interferometer built using a Raspberry Pi and Lego bricks.