# Stackable Lattice Basket — 4 sizes + parametric SCAD

A family of cross-stackable lattice baskets. Every basket has four

square corner posts that carry a **cone peg on top** and a matching

**cone socket** on the bottom. Stack any basket onto any other basket

— gravity + the 30°-from-vertical cone is the only "engine," and the

square ring of post bottom (≈ 410 mm² across the four corners) bears

the load. The cone is just for self-centring.

## What's in the bundle

- **stackable_basket.stl** — the original 14×11.5×3 cm tray (open

  short side, photographed in the listing).

- **stackable_basket_5x5x5cm.stl** — 5×5×5 cm cube. Tiny parts bin,

  earring/screw/SD-card-sized.

- **stackable_basket_10x10x5cm.stl** — 10×10×5 cm square tray. Good

  for cables, batteries, dice, charms.

- **stackable_basket_20x12x8cm.stl** — 20×12×8 cm deep tray. Pencils,

  remotes, USB hubs, bathroom bottles.

- **stackable_basket_leg.stl** — optional cone-foot leg. Print four,

  plug them into a basket's bottom sockets, and the basket sits on

  short feet for a "raised platform" look. Same socket geometry as

  the stack interface, so legs work with any size.

- **stackable_basket.scad** — parametric source. Top of the file:

  `basket_l`, `basket_w`, `body_h`, `open_side`, `strut_pitch`,

  `strut_w`, etc. Cone-peg + corner-post dimensions are shared, so

  every basket you derive STILL cross-stacks with the printed sizes.

## Print

- **Orientation:** flat bottom on bed. Cone peg points up. No

  supports needed — every overhang ≤ 30° from vertical (the cone

  socket on the bottom narrows upward at ~0.12 mm/layer @ 0.2 mm

  layer height, well inside FDM bridging tolerance).

- **Walls:** 3 perimeters, 0.2 mm layer height, 15 % infill (the

  lattice does the structural work). Bambu A1 / X1C / P1S all fine.

- **Material:** PLA is great. PETG works. Translucent filaments make

  the lattice look like a Czech crystal basket — recommend.

- **Bed size:** 5/10/14 cm sizes fit any printer. The 20×12 cm long

  variant needs a 220 mm bed (A1 / X1C / P1S OK; mini-printers no).

## Design notes

- Lattice = 45° crosshatch struts, 2.5 mm thick, 10 mm pitch.

- Wall thickness: 2.5 mm (lattice band + top rim).

- Floor thickness: 2.5 mm.

- Corner posts: 16×16 mm square × body height.

- Cone peg: Ø14 → Ø7, 6 mm tall. Socket: Ø14.4 → Ø7.4, 6 mm deep

  (0.4 mm radial clearance — slides on, doesn't bind).

- Open side: the SCAD lets you choose which side has no lattice + no

  rim (`open_side = "front" | "back" | "left" | "right"`). All

  shipped variants open on a SHORT side so the stack stays open in

  the same direction at every level.

## Customising

Open `stackable_basket.scad`, change the parameters at the top, hit

F6. Suggested overrides:

- Want a 30×10×5 cm long under-shelf tray? `basket_l=300, basket_w=100, body_h=50`.

- Want a tighter lattice? `strut_pitch=7`.

- Want the open side on the long edge? `open_side="front"`.

The published STLs are produced exactly via that path — see

`build.sh` (parametric one-liner per variant).

## Stacking math (in case you want to derive your own)

At the interface plane the corner-post bottom (16×16 mm minus the

Ø14.4 mm socket mouth, ≈ 102 mm² each × 4 ≈ 410 mm²) is what holds

the upper basket's weight. PLA crushes at ~70 MPa, so each tower of

3-4 baskets is rated for >> 28 kN — practical limit is what you fill

them with, not the plastic.

## License

CC BY — fork it, scale it, share what you make. Source SCAD is in

the bundle.