All credit to Daniel for the original design; however, the socket extender storage is too short for my set, I needed 250mm extensions, another 2 gridfinity longer. 

To make it fit and not go from 6 to 7 grifinity units, I've had to tighten up the nice bevelled edges in the original design, a compromise on form for function. 

The photo version is my first one, where I didn't allow quite enough space for the 150 mm extension, trying to allow up to 95 mm for the shorter one. That didn't work, but since the wall in between was so thin, I cut it out rather than adjust and reprint.

The uploaded version has had the adjustments made, so you won't have the same problem I originally did.

I have not adjusted the width or depth of the other parts of the inserts, so they will fit the original Milwaukee dimensions, including the impact one in Daniel's original design. This just allows for longer extensions.

I printed this with supports and 10% infill in PLA.