Features:

As shown these are made to be capable of stacking, but there are also indents running along the sides to allow holes that can have any rod up to 6.5mm or threaded rods for mounting, hanging or attaching other bins.

Printing:

This model should be printed in vase mode (2 bottom solid layers)

I used PETG and 0.2 layer height for the version shown, but other settings and materials might yield slightly less warping towards the top.

Finishing:

The parts are printed facing each-other and need to be cut apart. In the third image the parting line is shown running down the sides, but for the back you can either cut a straight line that will allow your bins to slide freely or a wavy line to act as a back stop(shown in the first image).