Abstract: A cannabis grinder includes a pair of square-cuboid-shaped body portions and a pair of grinding assemblies. One of the body portions has one of the grinding assemblies recessed in a substantially square face thereof. The other grinding assembly extends from a substantially square face of the other body portion. The grinding assemblies have teeth that are arranged to allow relative rotation of the grinding assemblies without interference between the teeth. Corners of a body portions proximate the grinding assembly are shaped to avoid striking digits of a user gripping the body portions during the relative rotation. Various methods of manufacturing and using such a grinder are also described.