Compressed air is necessary for the operation of LDM 3D printers. The pressure is used to push the piston inside the tank, in order to make the material flow inside the extruder. For this reason, a supply of compressed air at a pressure of at least 10 bar is needed at the machine inlet. The printer only needs pressure when printing and does not draw much air from the compressor, which only turns on when it needs to restore pressure. The connection must be made with an 8 mm diameter nylon hose (external diameter) connected to the adjustable pressure control valve, mounted on the machine. WASP recommends a compressor with the following characteristics: For Delta WASP 2040 Clay models: Capacity: at least 25 liters Pressure: at least 8 bar Oil/oil-free: preferably oil-free Silenced: recommended Example: Geotech AC 24-8-10 STANLEY DST 150/8/24 For Delta WASP 40100 Clay models or above: Capacity: at least 50 liters Pressure: at least 8 bar Oil/oil-free: preferably oil-free Silenced: recommended Example: Stanley DST 150/8/50 It is recommended not to connect other devices and accessories to the compressor dedicated to the printer. Compressors with lower capacities could cause discontinuity in pressure. The pressure control is present on the machine so it is not necessary for the compressor to be near the printer.