Made this sorting shelf from surplus steel that i had.
Square tubing, angle iron, 2mm sheet. Welds with stick.
Bends are made with my diy sheet metal bending brake. ( used 3mm radius with bends. )
Boxes are bought, price was 50 cent / each. Those supposed to be stackable, but it didn't work.
Decided to make my own shelf, where i can easily pick a box with me, when i need.