What the STL contains
The download is a solid shell, not a flat-pack kit: outer walls, inner walls, a floor, a rim, and the lid as a separate body offset beside the box. It is watertight and manifold, so your slicer will not need to repair it.
Because it is one piece, it prints in a single go with no assembly and no glue. That is the main reason to choose this mode over the laser one — the trade-off is that a 100 mm box on a 220 mm bed is close to the practical limit, and larger boxes need to be split.
Choosing a wall thickness
Wall thickness here is a single shell dimension, not a finger joint. For a 0.4 mm nozzle:
| Wall | Perimeters at 0.4 mm | Use it for |
|---|---|---|
| 2 mm | 5 | Small boxes, quick prints, light contents. |
| 3 mm | 7–8 | General enclosure. Stiff enough to hold a screw. |
| 4 mm | 10 | Heavy contents, or anything you will drop. |
Aim for a multiple of the nozzle width. A 2.2 mm wall on a 0.4 mm nozzle leaves the slicer trying to fill a 0.2 mm remainder, which usually shows up as a visible seam or a gap on the outside.
Print orientation
- Box body — print with the opening facing up, so the floor sits on the bed. No supports are needed anywhere, because there is no overhang steeper than the wall's own top edge.
- Lid — print it flat as it is modelled. If you want a textured top surface, flip it over and use a textured plate.
- Large boxes — past roughly 150 mm on the longest side, layer cooling becomes uneven and the walls can bow. Slow the outer perimeter down rather than adding supports.
Will the lid fit?
The inset lid is modelled 0.2 mm undersized on each side — 0.4 mm smaller than the opening in each direction. That is enough clearance for a typical FDM printer's dimensional error, but it is a loose drop-in fit rather than a snap fit.
If yours still binds, the practical fixes are to calibrate the flow rate and then scale the lid down by 0.2%, or to sand the four edges. If it rattles, a strip of tape on the underside of the rim is quicker than reprinting.
A flat lid is cut to the outer footprint and simply rests on top of the rim. Neither option is hinged.
Print instead of laser cut?
Laser cutting wins on speed for flat panels and gives crisp finger joints. Printing wins when you want one sealed object, curved or angled features later, or a single-piece part with no assembly. If you are not sure, the laser cut generator produces the same box as five flat panels you can inspect before committing.
Other box generators
- Laser cut box generator — finger-joint panels as SVG or DXF.
- Box generator with dimensions — how inner and outer dimensions relate.
- 3D box generator — the main page, with both laser and print output.