Joints replaced by parts that bend: the living hinge of a lid, the flexure hinge, the leaf spring parallel guide and the cross-spring pivot. The rotation and the stress of a flexure from beam theory, and the pseudo-rigid-body model that turns a compliant mechanism into a linkage with springs [1]. Bistable compliant mechanisms and snap fits, the compliant counterparts of the latches in Over-centre mechanisms. Exact constraint design [2], with the keyboard stabilizer of Bearings, Example 8. The printed flexure: layer direction, material (PETG, TPU, PP) and fatigue. Example: a printed bistable switch, its snap force measured against the model.