I Made This Shelf For Use With The Screw Organizers By Walter...
This Shelf Will Store 3 Trays With Lids
2 Of The M4/M5 Screw Organizer https://www.thingiverse.com/thing:807129
And
1 Of The M3 Screw Organizer https://www.thingiverse.com/thing:796504

If You Make It Please Post Pictures! :)
If You Like My Design And Find It Useful Tips Are Greatly Appreciated. :)