A computer-implemented method for determining a boundary representation, B-Rep, of a reference product resulting from a two-axis 3D printing process, the method comprising: - providing a stack of planes ((0, z 1, z 2,···, z m)), each couple of consecutive planes ([ z i, z i+1]) corresponding to a respective slice of the result of the 3D printing process; - for each couple of consecutive planes ([ z i, z i +1]): ▪ providing one or more respective tool trajectories ( T i); ▪ determining a respective 2D contour ( C i) corresponding to the one or more tool trajectories; ▪ determining a respective extrusion of the respective 2D contour bounded by a second plane ( z i+1) of the couple and a first plane (z i) of the couple; and - forming the B-Rep with the extrusions and portions of the planes, wherein the portions of the planes that form the B-Rep comprise, for each plane ( z i +1) which is the second plane of a first couple of consecutive planes {[ z i, z i +1]) and the first plane of a second couple of consecutive planes ([ z i +1, z i +2]), faces that each correspond to a respective region ( R j) of the plane ( z i+1) which is outside the 2D contour ( C i) respective to the first couple and inside the 2D contour ( C i +1) respective to the second couple, or which is inside the 2D contour ( C i) respective to the first couple and outside the 2D contour ( C i +1) respective to the second couple, wherein the method further comprises: - prior to the providing of the stack of planes, providing a 3D modeled object representing a reference product, the stack of planes and the one or more tool trajectories respective to each couple of consecutive planes being provided based on the 3D modeled object representing the reference product; and - an analysis of the B-Rep formed with the extrusions and the portions of the planes, the analysis comprising a comparison between the B-Rep formed with the extrusions and the portions of the planes and the B-Rep of the 3D modeled object representing the reference product, wherein the analysis comprises a micro-crack detection. - providing a stack of planes ((0, z 1, z 2,···, z m)), each couple of consecutive planes ([ z i, z i+1]) corresponding to a respective slice of the result of the 3D printing process; - for each couple of consecutive planes ([ z i, z i +1]): ▪ providing one or more respective tool trajectories ( T i); ▪ determining a respective 2D contour ( C i) corresponding to the one or more tool trajectories; ▪ determining a respective extrusion of the respective 2D contour bounded by a second plane ( z i+1) of the couple and a first plane (z i) of the couple; and ▪ providing one or more respective tool trajectories ( T i); ▪ determining a respective 2D contour ( C i) corresponding to the one or more tool trajectories; ▪ determining a respective extrusion of the respective 2D contour bounded by a second plane ( z i+1) of the couple and a first plane (z i) of the couple; and - forming the B-Rep with the extrusions and portions of the planes, wherein the portions of the planes that form the B-Rep comprise, for each plane ( z i +1) which is the second plane of a first couple of consecutive planes {[ z i, z i +1]) and the first plane of a second couple of consecutive planes ([ z i +1, z i +2]), faces that each correspond to a respective region ( R j) of the plane ( z i+1) which is outside the 2D contour ( C i) respective to the first couple and inside the 2D contour ( C i +1) respective to the second couple, or which is inside the 2D contour ( C i) respective to the first couple and outside the 2D contour ( C i +1) respective to the second couple, wherein the method further comprises: - prior to the providing of the stack of planes, providing a 3D modeled object representing a reference product, the stack of planes and the one or more tool trajectories respective to each couple of consecutive planes being provided based on the 3D modeled object representing the reference product; and - an analysis of the B-Rep formed with the extrusions and the portions of the planes, the analysis comprising a comparison between the B-Rep formed with the extrusions and the portions of the planes and the B-Rep of the 3D modeled object representing the reference product, wherein the analysis comprises a micro-crack detection. - prior to the providing of the stack of planes, providing a 3D modeled object representing a reference product, the stack of planes and the one or more tool trajectories respective to each couple of consecutive planes being provided based on the 3D modeled object representing the reference product; and - an analysis of the B-Rep formed with the extrusions and the portions of the planes, the analysis comprising a comparison between the B-Rep formed with the extrusions and the portions of the planes and the B-Rep of the 3D modeled object representing the reference product,