Bunnings Montgomery 12 Compartment Storage Box Inserts

Bunnings have excellent 12 compartment containers for low cost, however small things can slide underneath the removable inserts. 
This quick to print insert prevents this from occurring and allows easy removal of the parts. 

Fits into these units purchased from Bunnings in Australia.
https://www.bunnings.com.au/montgomery-12-compartment-organiser-storage-box_p2580706

Edit: 23-9-24 - Now with left and right cutout options for the edge compartments. Print 2 of each for each  12 compartment tray.