This is a collapsible crate, or a foldable box, or whatever you want to call it.
You'll need to print:
- 1x crate_top.stl
- 1x crate_bottom.stl
- 2x crate_side.stl
During assembly, you may need to use a knife to trim the nubs that are part of the hinges - different 3D printers, and slicers will print with different tolerances. Then, use a pair of pliers, or a vice to force the parts together, they should snap in and hinge loosely.
If the print-in-place hinges that are part of crate_top and crate_side are too stiff (with the parts fused together), you may need to adjust your slicer's layer height or extrusion rate).