An anti-reflection coating layer system is composed of 4 oxide layers. The strain relief device can further include first and second clamping surfaces that face in diverging directions and extend along a substantially V-shaped profile. A mobile terminal is provided which enables wireless transmittingreceiving of signals between at least the first and second terminals. The first aperture array element is provided with cooling channels in the non-beam areas for transmission of a cooling medium for cooling the array element. This method also ensures the safe removal of the support structures without damage to the three-dimensional object.