Uploaded another design to printables. This time a simple stackable 1x1 gridfinity holder for 1/4" hexdrive bits.
I could find plenty of gridfinity bit holders, but none that were stackable and 1x1. So I designed my own in openscad
https://www.printables.com/model/1615225-gridfinity-bit-holder-bin-1x1-stackable