I started with original model that was a great idea to give more functionality to the container. I also liked that it is made from 2 or 3 parts instead of single print.  The problem however with 4mm inserts is that they push out the retaining rails on the box, making it look just not right.  For many, this might be a nonissue. But for me, it is important that it look as close to OEM as possible, hence the model.

This part works with ref. 4mm dividers (attached here as well). 

you can print all models vertically, to be able to pack the print bed and get all your dividers for the box in single print. Use organic supports to ensure overhand support is addressed, these are easy to remove. I used 0.4mm Nuzzle, PLA+ and 0.15mm Layer height.

turn skirt off to get all the inserts for a single box in one print. Project file provided below.