Design a part. Print it on any 3D printer.

LittleBoxes.ai is a free online parametric parts generator. Pick a part type below — boxes, vented enclosures or mounting brackets — and start designing in your browser. No account needed.

Boxes Storage & trays Vented enclosures For electronics, batteries, airflow Mounting brackets L-brackets & flat plates Stackable boxes Stack-friendly with a registration collar
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LittleBoxes.ai preview
Pick what to design

Three part types — no account needed to try

Click a card to open its designer with a live 3D preview. Register free when you're ready to download the STL.

Design a box

Open-top storage boxes and organizer trays with rounded edges, your exact dimensions, and watertight STL output.

Open box designer

Design a vented enclosure

Sharp-cornered boxes with five vent patterns — slits, circles, teardrops, diamonds, or honeycomb — across any walls you choose.

Open vented designer

Design a stackable box

Sharp-cornered open-top boxes with a registration collar on the top rim, so identical boxes stack without sliding.

Open stackable designer

Design a bracket

L-brackets and flat mounting plates with optional gussets, countersunk holes, and one- or two-row hole patterns.

Open bracket designer

Parametric dimensions

Dial in length, width, height, wall thickness and dividers — generate storage boxes and organizer trays sized exactly for what you need to store.

Vented enclosures & brackets

Design vented boxes with adjustable patterns for electronics or batteries, plus L-brackets and flat mounting plates with countersunk holes — all parametric.

Print-ready STL export

Download clean, watertight, manifold STL files ready to slice in Bambu Studio, PrusaSlicer, OrcaSlicer or Cura — no mesh cleanup required.

AI-assisted design

Describe the box you want and let LittleBoxes.ai suggest smart defaults, dimensions and compartments for your project.

How It Works

From idea to printed box in three steps

No CAD experience required. LittleBoxes.ai handles the geometry so you can focus on what goes inside.

1
Describe your box

Tell us the size, compartments, and any features you need — or start from a ready-made template.

2
Preview and tweak

See a live 3D preview and adjust dimensions, dividers, lids, and wall thickness until it's just right.

3
Download & print

Export a print-ready STL file, slice it in your favorite slicer, and print on any 3D printer.

What is LittleBoxes.ai?

LittleBoxes.ai is a web app for designing small organizer boxes and exporting them as STL files for 3D printing.

Which 3D printers are supported?

Any printer that accepts STL files works — FDM, resin, or otherwise. Slice in your favorite slicer and print.

Do I need CAD skills?

Not at all. Describe what you want or adjust a few sliders — LittleBoxes.ai builds the geometry for you.

Can I customize compartments and lids?

Yes. Add dividers, snap-fit lids, rounded corners, and labels — all directly from the editor.

Get Started

Start designing your first little box

Try the designer right now — no account needed. Register free to save your designs.

Try it free — no account needed Register or Log In