Composition Book Lunchbox — a snack caddy shaped like a school notebook

A lunch box shaped like a school composition notebook. Closed on a desk it reads as a book; open it is two bays for a sandwich and a snack tub.

150 x 105 x 52 mm outside, 144.8 x 91.6 x 43.5 mm inside. No hardware — the hinge pin prints too. No supports, nothing to rotate.

Honest Limitation

the clasp is a light catch, not a latch. The fore-edge strap hooks over the lid but does not hold perfectly — closing takes a deliberate press, and a hard shake can pop it open. It stays shut sitting in a bag; do not carry it upside down. An elastic band or a strip of Velcro fixes it in ten seconds. You should know that before spending eight hours of filament.

The Colour Split Is The Design

Base = page block, lid = cover, ink = title. Purge is ~0.35 g per bi-colour layer, so splitting colour across PARTS costs nothing: only the four layers carrying the title are bi-colour, ~1.4 g for the set. A cover-coloured spine would be ~230 such layers and ~80 g of purge, so the spine reads through relief instead.

FILES: clb_base (1), clb_lid (1), clb_bar (1, the hinge pin), clb_divider (0-5, optional), clb_ink (the title). For a two-colour lid print clb_lid_2c.stl INSTEAD of clb_lid.stl — one file, two named solids: Import, right-click, Split to Parts. Ironing off on the lid top face.

Printing

base cavity up; lid cover art UP; bar lying down with a brim; dividers flat. PETG or PP, not PLA — PLA softens near 60 C and this lives in a bag in the sun. ~190 g at 15% infill.

Assembly

lay the cover on the base so its three knuckles drop between the base's four, then push the bar through all seven.

NOT food contact — a caddy for food-safe containers. Hand wash. Parametric OpenSCAD source included.