Apparatus and method for restricting 3d printing

The present disclosure relates to an apparatus for printing three-dimensional, 3D, objects by a 3D printer. The apparatus comprises interface circuitry configured to receive a G-code file comprising instructions for 3D printing of one or more 3D objects. The apparatus further comprises processing circuitry configured to classify a 3D object represented by the G-code file, and restrict 3D printing of the 3D object if the 3D object is classified as at least a part of a dangerous/illegal object.