stackable trays with bins

It's one of my first 3D designs!
I made this because i need to organize my electrical components. They are stackable and the inner space is organised in a 3x3 grid.
any feedback on design / functionaility is welcome :)

Other sizes
half height: https://www.thingiverse.com/thing:2828592

Custom bins and trays
headers: https://www.thingiverse.com/thing:2828457

Original sizes
Here are the original sizes in which I designed this. If you keep the scaling the same you can increase or decr