Design a part. Print it on any 3D printer.
No account needed to design and download — register to save your work and access the Drawer Planner beta.
From idea to printed part in three steps
No CAD experience required. LittleBoxes.ai handles the geometry so you can focus on what the part is for.
Choose a part type from the menu above and set your dimensions.
See a live 3D preview and adjust dimensions, walls and features until it's just right.
Export a print-ready STL file, slice it, and print on any 3D printer.
Create a free account to unlock more
Registering saves your designs and unlocks the Drawer Planner beta.
Save your designs
Save every design to your account and come back to tweak or re-download it anytime.
Drawer Planner Beta
Get beta access to the full Drawer Planner and design multi-box layouts that fit a whole drawer.
Parametric dimensions
Dial in length, width, height, wall thickness and more — generate parts sized exactly for what you need.
Print-ready STL export
Download clean, watertight, manifold STL files ready to slice in Bambu Studio, PrusaSlicer, OrcaSlicer or Cura — no mesh cleanup required.
Sized for your printer
Pick your printer or enter a custom bed size and LittleBoxes.ai flags any design that won't fit — so every STL prints first time.
What can I make?
Design and download all of these in your browser, each with a live 3D preview and print-ready STL export: Boxes, Vented boxes, Mounting brackets, Remote holders, Stackable boxes, Phone holders, Lids, Shelf rails.
Can I make a lid for a box I already designed?
Yes — open any box, vented box or stackable box designer and click "Create a lid". It carries the outer size, wall thickness and corner style into the lid designer so a cap or inset lid fits straight away. You can also enter your box's measurements directly in the lid designer.
Do I need an account to download an STL?
No — designing and downloading STL files needs no account. An account only lets you save your designs to return to later and use beta features like the Drawer Planner.
What do I get if I register?
Registering lets you save your designs and return to them anytime, plus beta access to the Drawer Planner for designing multi-box layouts that fit a whole drawer. After registering, click the link in the verification email we send to unlock saving — designing and downloading work right away, no verification needed.
Can I make adjustable shelf rails for a cabinet?
Yes — the shelf-rail designer generates sawtooth pilaster rails sized to your board thickness and cabinet. Print four (two per side), screw or stick them to the walls, and drop a wood board into matching notches. Rails taller than your printer auto-split into sections joined by printed dovetails.
Which 3D printers are supported?
Any printer that accepts STL files works — FDM or resin. The exported geometry is watertight and manifold, and slices cleanly in Bambu Studio, PrusaSlicer, OrcaSlicer, Cura and Lychee.
Do I need CAD skills?
No. Adjust a few fields and watch a live 3D preview — LittleBoxes.ai builds the parametric geometry for you and exports a ready-to-print STL.
Start designing your first part
Pick a part type and start designing — register any time to save your work.
Start designing Register or Log In