The paper deals with the comparison of milling of conventionally produced and 3D printed
samples. All samples were made from M509 material and were dimensionally identical. During
milling, the machining forces, vibrations in three directions, surface roughness of the machined
samples and wear of the used replaceable inserts were measured. By comparing the above
mentioned quantities, we can get an idea of the problems of machining materials from 3D
printers. In this case on a very progressive material M509 which is a type of maraging steel,
specifically referred to as Maraging Steel 18Ni (MAR M-509). It belongs to the group of ultra-high
strength steels which are known for their combination of high strength, toughness and good
machinability. Maraging steels have a low carbon content and are alloyed mainly with nickel
(approx. 18%), as well as cobalt, molybdenum and titanium. Thanks to these elements and the
ageing process (maraging), they achieve exceptional strength and resistance to fracture.