Since people wanted to see how it turned out. This is a 330x330 object that covers the entire purported print area of my machine.
I'm ashamed to admit that I undershot my filament usage calculation slightly, and I chickened out just before the finish line. I didn't have any more white in stock, so I switched to some grey of the same type from the same manufacturer by doing a mid-air refuel, shoving the end of the new spool in chasing behind the very tail of the old one. I don't think it looks too bad. I may just spraypaint the entire thing white later anyhow. I wanted to use a light color in order to more easily spot and keep track of screws and springs and such.
If there were ever a poster child for printing something with a 0.4mm layer height of possibly even more, it may be this. One wonders how much infill you'd need to make it strong enough to sit on. Otherwise, I don't know what the heck you'd do with it.
If you're a "regular sized adult" I honestly think you can get away with 30% adaptive cubic, and 5-6 walls and top/bottom layers.
That's pushes it to 2.4kg filament and a +2 days print though with a regular 0.4mm nozzle and 0.3mm layer height.
Sounds plausible to me. On reflection, I think I'd just run off a wooden box on my table saw if I need a cube to sit on.
My problem, as I'm sure many others have, is admitting when 3D printing something probably isn't the best solution...
There are many good applications for FDM printed items. But I still have a metal lathe, mill, drill press, and welders for all the other times that FDM is a poor choice.
Yeah I agree, 3d printing is not the right tool for a simple large box.