This is a remix of the gridfinity with pin 1x1 box, bottom was sliced off to provide the same base and SD card storage added to the top.
See https://makerworld.com/en/models/440625#profileId-346320 and https://makerworld.com/en/models/440624#profileId-346300 for the excellent gridfinity with pin system which is a version of gridfinity that doesn't need magnets.