Design printable vented boxes online — no CAD required
A focused, browser-based generator for parametric vented enclosures. Set the dimensions, choose how many slits each wall gets, optionally round the outer vertical corners, and download a watertight STL that slices cleanly in Bambu Studio, PrusaSlicer, OrcaSlicer or Cura.
Open the vented box editor Back to LittleBoxes.aiWhat "vented" means here
Vented boxes are exactly what they sound like: parametric storage boxes with vertical slits cut through one or more walls so air, heat or moisture can move through them. Typical uses include electronics enclosures (Raspberry Pi, mini-PC, ESP32 / ESP8266 projects, mesh routers), filament dehydrators and dry boxes, battery holders for 18650 / LiPo packs that need passive cooling, ventilation grilles for cabinets and racks, and anything else that lives indoors and needs airflow without exposed contents.
Every vented box on LittleBoxes.ai is built from sharp-cornered Manifold geometry so the exported STL is always watertight (zero non-manifold edges) and prints reliably on FDM machines.
What you can control
Dimensions
Length, width and height in mm, cm or inches. Wall and bottom thickness independently tunable.
Vent slits
3, 5, 7 or 9 vertical slits per wall, in 1.5 mm or 2.5 mm widths. Each of the four walls can be independently vented or solid.
Rounded outer corners
Optional: softens the four vertical wall corners while keeping the base sharp and flat for reliable bed adhesion. The radius scales automatically with wall thickness and clamps for small boxes.
Printer profile
Pick your printer (Bambu A1 / P1S / X1C, Prusa MK4, Creality Ender 3, Anycubic Kobra, or custom bed size). The editor warns you if a design exceeds the bed.
Why a sharp base matters
Rounded bottom corners look elegant in CAD but cause real problems in FDM printing: tiny first-layer overhangs, weaker bed adhesion at the corners, and stringing under the curve. LittleBoxes.ai's vented-box generator gives you the best of both worlds — a sharp, full-rectangle base for solid adhesion plus rounded vertical wall corners above it for a softer visual finish. The rounded walls sit directly on top of a solid base slab, so there is no overhang anywhere in the geometry.
Compatible printers and slicers
The exported STL is a watertight, manifold mesh that works in any modern slicer:
- Bambu Studio (A1 mini, A1, P1S, X1 Carbon, H2D)
- PrusaSlicer and SuperSlicer (MK4, MK4S, MINI+, XL)
- OrcaSlicer (any supported FDM printer)
- UltiMaker Cura (Ender 3 / 3 V2 / 3 V3, Kobra 2 / 3, generic FDM)
Every STL passes Bambu Studio → Repair → No errors found
and PrusaSlicer → No defects detected. If you ever see
a non-manifold-edge warning on a LittleBoxes.ai export, please
let us know — it's a bug we want to fix.
Frequently asked questions
Do the slits stop at the top?
Yes — the slits live in the centre 72% of each wall and never breach the top rim or the base, so the box stays structurally sound regardless of slit count.
Can I have a lid?
The vented editor is open-top by design — most ventilation use cases benefit from an open top. If you need a closed box, use the standard editor and add cutouts manually.
What if I want only the front and back walls vented?
Each wall has its own toggle. Turn off the walls you want solid. The slit count and width settings apply only to the walls you've enabled.
Will the slits clog with supports during printing?
No — the slits are vertical, so on a normally-oriented print (open side up) they print bridgeless and never need supports.
Ready to generate one?
Open the editor, dial in your dimensions, and download an STL in under a minute.
Open the vented box editor