That would be an interesting Show HN. A camera(s) setup with something like OpenCV and some ML processing to analyze a batter's swing, find their best bat shape, then use some sort of automated lathe to cut their bat based on the findings. Lather, rinse, repeat until you've iterated through to the "perfect" bat for that hitter.
Yeah, but that's not a very HN way of doing it though. Bring in the AI, then add some crypto, and the code must be written in Rust. If there's a UI, then Next/React must be used to re-write the existing HTML/CSS only version, because that's just not even trying. Oh, and it needs to be done over a weekend