Printing system for printing an object having a surface of varying height

A printer control system for controlling the printing of an object on a support by stacking layers of material on top of each other, each layer derived from a pass image, the object having a surface of varying height, the printer control system comprising

• a user interface having a display device and arranged to visualize in a window on the display device a preview image before printing of the object, the preview image comprising a representation of the surface of the object,
• wherein the printer control system comprises
• an analysis section which is configured to analyze the pass images in order to predict before printing the object a location of a contouring artefact at the surface of the object and to create a binary image that represents the contouring artefact as viewed from a top of the object, and
• a transformation section which is configured to add the binary image at the predicted location as a contour representation to the preview image, the contour representation being visually distinguishable from the representation of the surface of the object in the preview image.