3%Milk is a mod of 2%Milk with reset button, place for a battery and a closed back.
The reset button is 6x6x5mm My battery is 7x17x42mm the available space is 7x23x43.
The original is licensed under The CERN Open Hardware Licence v1.2 and can be found at https://github.com/Spaceboards/SpaceboardsHardware/tree/master/Keyboards/2%25%20Milk . My additions are dual licensed under the same license or CC-0
The keys i used are https://www.printables.com/model/966337-improved-cherry-mx-compatible-flat-top-keycap with the bottom mm cut off with the stem of https://www.printables.com/model/188979-flat-keycap-cherry-mx unfortunately their licenses are incompatible so i can't share the remix.
The author remixed this model.
Added a back lid and closed the connector opening to usb-c size. also added a reset button/hole and a pro-micro/nice!nano holder.