hinges

A print-in-place living-hinge mask, an interlocking knuckle hinge with a pin bore, and snap lock / socket connectors.

KnuckleHingePair(length=40, segs=5).shape()interactive · drag to orbit
length = 40 mm · segs=5

rendered & measured

Two leaves meshed around one pin, exported as a single mesh. Folding re-triangulates the surface but moves mass rigidly.

variants · click to load
370triangles
5,886.5mm³ volume
40×46×6bbox mm
>>> KnuckleHingePair(length=40, segs=5).shape()
0.02%
Δvolume across the fold = 1.2 mm³. A rigid rotation, not a distortion — the pin bore and knuckle mesh stay closed.
6 tests