I had already printed the “Gridfinity 2x2 holder for hex screwdriver bits” by Boolean263 but I needed it to be like the “Gridfinity 2x2 screwdriver hex bit holder stackable version” by Jake. 

So I create this expansion just to not have to print it again.
I used CA glue to join the pieces.

It can be used with all 2x2 Gridfinity models.