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To print in 3D it is essential to consider the following aspects when modeling an object:
Closed objects. A model designed for 3D printing must be closed, or watertight (in English it is said that it must be watertight)
The volume. When you draw a 3d model to have a photorealistic object, most of the time you create surfaces without thickness. If we want to draw a 3D model with the intent to print it in 3D, it is essential that this has its own thickness or volume. (Minimum thickness 1 mm).
Manifold . It is essential that the object for 3D printing is manifold, or our 3D model must have an inside and an outside. If an edge is shared with more than two faces it is said non-manifold and can not be printed.
Normal . It is essential that the surfaces of the 3d model have the normals oriented in the right direction. If they were to be reversed, the object can not be printed because the processing software can not determine the inside and the outside of the model (see Manifold)
Supports . It is of fundamental importance to support with the removable supports the faces that do not rest directly on the support surface.