A powder bed-based laser melting (“PBLM”) system comprising a process chamber having a chamber floor forming a working plane, and a powder application unit arranged in a working position in the process chamber and above the chamber floor during ongoing operation. The powder application unit is movably attached to a support structure such that the powder application unit can be moved at least partially between the working position and a rest position. The chamber floor is easily accessible with at least one component of the powder application unit arranged immovably in the working position during operation. In a particular embodiment a rail-shaped linear drive and/or a guide of the powder application unit configured as guide rails is positioned further away from the chamber floor in the rest position, and/or between the rest position and the working position, than in the working position in the ongoing operation of the PBLM system.