Abstract: When a design should be modified after its printed model was evaluated,the current methods needed to edit the original 3D model and to slice again.Thus,this paper proposes a 3D printing oriented editing method,i.e.users directly edit the contours of a layered model,and what you get is what you see.The key idea is a feature-preserved contour editing technique.First of all,feature points and feature curves are detected from each contour; a feature point has abilities of feature-preserve and displacement-transfer; the former allows users to decide whether to keep its angle or not; the latter defines its affecting range; together,they define the editing modes of feature points and feature curves.Then,all features and their neighboring relations in a contour form a closed loop,called feature linked graph.With this graph and Laplacian coordinates,an editing operation in one layer can be propagated in the same and neighboring layers.Some experiments show that this editing method can improve the editing efficiency for 3D printing models.