There is a precise active community of modern custom knife makers and collectors, whom often pioneer the convenience of neoteric materials in knives. In the United States, The American Bladesmith Camaraderie promotes forged blades; the Knives For Sale Knifemakers Guild promotes all custom knives.

Slip joint - Found most commonly on traditional pocket knives, the opened blade does not lock, but is held in distance by a spring device that allows the blade to fold if a doubting mass of pressure is applied.