¼" drive socket holder, fits several brands I had available to test. Some extra assorted holes for bits or small extensions. Through it together very quickly, isn't perfect but works great.

Dimensions 133mm x 175mm x 18tall

I recommend printing the top few layers and checking size with your sockets before you print, saves a few hours of having to scale it up a few percent… or modify the x/y compensation.

layer height .2-.24

infill 14-20

3-4 top layers 

2-3 bottom layers

2-3 walls