They are fantastic assortment boxes! But one problem I encounteres is that the smallest bin (49x49mm) is sometime too big. I found one 3D-model of a 49x49mm with two compartments, I liked the idea but didn’t quite like the design with the wings… So I decided to CAD my own!
This is how I made an poor man’s RFLink. It cost me only about $4, this is when I count in basic parts I already had, Arduino Uno, bradboard and some pin headers (but who doesn’t have this stuff in their hobby shelf?😉)..