I use these to organize my different printer papers, like glossy, single/double sided, by weight, etc. printed upright vertically. and adjust the scale to fit your printer, for mine it was 250mm in height. i used a 5mm brim, and 3 walls with 20% infill, but i also used pla so i was worried about sagging. You could use a support blocker on the legs portion to save time and filament.

If you want them to fit the boxes nice paper comes in then you should scale width by a small amount like 2-5%. my boxes fit but they are super tight.

Once you find your height scale (necessary), and your width scale (optional), then you can print a tower of these as tall as you want. Maybe use a soldering iron to weld them together too