Jigs and fixtures can be manufactured using CNC machining and 3D printing, but in general, 3D printing offers a number of advantages. In this case, additive manufacturing is cheaper and faster than CNC machining by a wide margin. Also, only 3D printing offers engineers the flexibility to frequently re-optimize design. Jigs are tools that hold a cutting tool in place or guide it as it performs a repetitive task like drilling or tapping holes. Fixtures, on the other hand, do not guide a cutting tool, but hold a workpiece steady in a fixed position, orientation, or location.