This thing - selfmade hotswap socket for handwiring keyboard on Gateron or Ketchron low profile switches.
Support for optional RGB led (SK2812 mini) installation.
I am used it for make Corne v3 - based Cornedion [https://www.printables.com/model/1315503-handwired-cornedeon-corne-v3-plus].
The author marked this model as their own original creation.