These are simple, interlocking, modular bins.
They come in 3 lengths, 3 widths, and 4 heights. If you don't see the size you want uploaded here, ask me in a message or comment and I'll generate the file.
The 3rd height fits perfectly in the shorter drawers of an Ikea Alex drawer unit. The 4th height fits perfectly in the taller drawers of an Ikea Alex drawer unit.
Prints well in PLA. For added flexibility, also prints well in PETG.