Parts are built in layers in thicknesses ranging from 20 to 100 microns.The company’s current range of machines feature variable powder delivery, ultra low oxygen content in the build atmosphere, and a safe-change filter system to minimize user contact with materials.Two systems are available: the AM125 and the AM250, both of which feature vacuum technology and low gas consumption. Both utilize "machine tool" engineering in design, operation, and serviceability, emphasizing ruggedness and ease of operation and can reduce consumable costs with a soft re-coater blade that can be rotated several times before replacement, use of low-cost filter elements, and low gas consumption.Renishaw’s systems can process a wide variety of materials, including 316L and 17-4PH SS, H13 tool steel, aluminium Al-Si-12, titanium CP, Ti-6Al-4V and 7Nb, cobalt-chrome (ASTM75), and Inconel 718 and 625. Both systems are designed for rapid material changeover, with the AM125 utilizing a cassette type materials delivery system and the AM250 a removable hopper. A valve interlock on the AM250 allows addition of extra powder while the process is running. Safe processing of reactive materials, such as titanium and aluminium, is ensured with features such as a gas knife that clears away reactive, sooty emissions, and a heated build plate.The AM125 provides a part-build volume of 125 x 125 x 125 mm (X-Y-Z), and the AM250 provides 250 x 250 x 300 mm (X-Y-Z) with Z axis extendable to 360 mm. Both have build rates of 5 to 20 cm3 per hour, dependent on the material, part density and geometry. The AM125 offers a choice of 100 or 200 W laser, and the AM250 a 200 or 400 W laser.Both machines feature a fully welded vacuum chamber, enabling low-pressure evacuation followed by a recharge with high purity argon gas. Gas consumption, after the initial chamber flood, is low, and allows operation at oxygen concentrations below 50 parts per million.