Mainly, a rapid prototyper: typically a 3D printer of plastic or plaster parts 3-axis CNC machines: 3 or more axes, computer-controlled subtractive milling or turning machines Printed circuit board milling or etching: two-dimensional, high precision milling to create circuit traces in pre-clad copper boards[6] Microprocessor and digital electronics design, assembly, and test stations Cutters, for sheet material: laser cutter, plasma cutter, water jet cutter, knife cutter.