When using StephanieS's bearing upgrade (https://www.printables.com/model/490357-stacker-f-box-bearing-upgrade) the boxes can't be stacked vertically since the hub sticks out the bottom and makes the stack wobble. So I've made longer feet. They're pretty much identical to the original feet just taller and you can use the original screws that came with the F-Box. I printed this on a Prusa MK4 with MatterHackers PLA Pro (but any PLA should work) at 0.15mm layer height with a 0.4mm nozzle.
The author marked this model as their own original creation.