I didn't make it! It's from a japanese dude. This is the project: https://github.com/atsuyuki/dactyl-manuform-skeleton-edition-4x5 This is the build guide (in japanese, but DeepL helped me): https://www.creativity-ape.com/entry/2021/06/18/121519

Despite my love for it, I wouldn't really recommend it to anyone. It requires non-standard screws that were a pain to source and the project file itself is mostly hand-edited STLs from the generated OpenSCAD project, so you can't just regenerate the files. If someone actually wants to go for it though, I'd be glad to give out the aliexpress stores I used for the hard to source bits and things like that!