I purchased a new set of nut drivers as part of a shop organization project and I could not find a model that would fit, due to the range of sizes, so I created my own.

It uses a 4x4 Gridfinity base, is 4 units tall, and is stackable, as you can see from the photos.

The nut drivers may be found on Amazon.com here. There are both metric and SAE (imperial) sizes so you'll need to print two bins for both.