A parametric, fastener-free printed-enclosure system. Six flat-printed plates snap together with sine-wave joints — the joint is also the ornament. Build it like a cabinetmaker, not like a gadget.
Plates meet along a sine wave that runs in the plate's own plane. Where a wave crest reaches the receiving plate's outer face, it passes through and shows — a stitch. Where it sits below, the receiving plate has a pocket, and both sides carry a small lip that snaps.
The crests are the visible stitch. The troughs are the hidden snap. No screws, no glue — the printed geometry does the work fasteners normally do.
A conventional two-part shell prints its walls vertically — layer lines across every visible face, loaded across layers, where PETG's notched impact strength roughly halves. A flat plate has its layer lines parallel to the face, is loaded in-plane in the strong direction, and its outer face is an ironable top surface. No overhangs anywhere.
Six parts cost nothing when they're pre-printed as stock and assembled to order.
Which faces become bulkheads is a product decision, not a QUILT one — whatever carries the input and output is the wave-stitch-wave-stitch pattern.
A TPU lattice is generated around whatever must be enclosed, sized to the box's full internal height. The lid and base each carry a lip that traps it — closing the box locks the contents in the middle. Ribs and an accessory grid exist as options, off by default; a bare 4mm plate barely deflects under load, so they were never structural.
Every axis is a whole Gridfinity unit (42mm). QUILT's own unit is 14mm — the greatest common divisor of Gridfinity's 3×14 and OpenGrid's 2×14. The reference box is 168 × 84 × 84mm, about 263g of PETG, three print plates, two boxes per 1kg spool. Nothing dimensional is settled yet — the generators are parametric, so this costs nothing to change.
Honest status: this is a working design, not a finished product — version 0.7, and a known geometry defect in the current corner joint is still being worked through. Real footage and prints to follow.