I am playing with 3d printed divider/inserts for my Plano. I can divide a "normal" plan square into four smaller ones when I want. I am just working on what is the most functional for finding things and set-up. The neat thing about the inserts is I can pull them right out of the plano, rather than having to grab the entire tray I can pull a square out. And it appears "small enough" that I can just dump the contents on the table rather than fiddling through with tweezers if I get frustrated. Easy enough to scoop the four sections back up and in when I find what I want.