From the Loftsmith community

Parcel box hinge 70 mm

Gives a cardboard parcel box a lid that actually swings. Two leaves, each with three countersunk screw holes, meet in a knuckle that prints as a pair, so there's no pin to hunt for. Change the hinge length and leaf width to suit your box.

2 parts · 13 g · 70 × 64 × 10 mm