Made these simple tray dividers to use in my 16-tray plastic utility boxes for the different screw/bolt sizes. Had to add notches on each top-edge to clear the frame holders.
The utility box is made in South Africa by Perma Products and is called a 16 Drawer Utility Box - web link:
The Sketchup .SKP file is included if you wish to change any sizing to fit your trays.
The .STL part is sized at 50mm x 34mm x 1.4mm for my tray sizes.
Printed in PLA.