Method and device of detecting part quality of a three dimensional manufacturing object

A device for determining a quality indicator of an object that has been manufactured by a layer-wise additive manufacturing method, wherein in the layer-wise additive manufacturing method the object is manufactured layer by layer by a solidification of a building material at positions corresponding to the cross-section of the object in a layer among a plurality of layers, wherein the device comprises at least the following:

• a provision unit that provides a first dataset assigned to a process monitoring device, wherein the first dataset includes process irregularity information detected by the process monitoring device and assigned to each of a pre-defined number of solidified positions of the layer;
• a detection unit, which, when in operation, detects for the plurality of layers a relative frequency of occurrence of a process irregularity in a layer and assigns a grade indicator value to the solidified object cross-section in the layer according to the detected relative frequency;
• assigning to different ranges of values of the relative frequency different grade indicator values indicating different quality levels;
• a generation unit, which, when in operation, generates a second dataset, in which a grade indicator value is assigned to the object cross-section in each of the plurality of layers;
• and
• a determination unit for determining a quality indicator by using the second dataset, the quality indicator indicating a quality of the manufactured object.