I use Hatchbox filament boxes without tops, to store spare parts and materials. with these corners I'm able to stack them very high as it is primarily plastic that bears the load.

You'll need for corners. Two in original orientation, and two mirrored.

I suggest printing in as-pictured orientation. You will need supports, or you can try awesome arc overhangs (which is how I printed the blue ones).

To ease recycling, I've included versions with recycling symbols embossed.