This is a remix to add the handles on all four sides. I found that after printing the box, the heat would sag the walls. The handles add the needed extra rigidity when one is stacking more than just a couple boxes.

I found that the box was a little large and for convenience, I included a 80mm version as well (scaled 67%)

Kossel XL

No

No

0.25mm

Slic3r shell mode at 195C 2 bottom layers

intersection()
{
import("Stacking_Box_fixed.stl");
rotate([0,0,90])import("Stacking_Box_fixed.stl");
}