I had, like probaply lots of people, a couple of electronic and mechanical assortments stacking on each other. And all in different sizes. So I made this holder for boxes!

Just measure the outside of your box, be careful for any latches or hinges (add them to you measurement) and maype a mm more, and type it in to OpenSCAD. The sizes in OpenSCAD are the inner ones of the holder.

I generated all of them with the standard 45° angle, that I found was the best compromise between not falling out (even though they aren't likly to fall out when flat), not taking too much space, easy access to the boxes and reduced print time due to no needed supports.

I installed them with some double sided tape, and then used some small wood screws for the “not so wood” IKEA cabinet I mounted them to. After each layer I put my level on top of the last layer as spacing and to level the next ones.