I have a few drill bits, screwdriver bits with magnetic holder etc stored inside the case with my battery drill - a DCD796D2. However, whenever I close the case and move it around the "bits" and pieces would scatter around the inside of the case. So I designed a box to house the smaller items, that fits in the centre compartment and stays in position when the case is closed. I printed this in PLA and I am not sure how durable it will prove to be, so only time will tell. Update: Still okay after 14 months. :)