Fixing a 3D model means convert lines and curves (Figure A, vectors) into meshes (Figure B, triangles)

Figure A
Figure B

It means that the item becomes solid. The function is called Make Solid. 

A 3D printing technician deals daily with lots of .stl files, some of them are correct and others are compromised. 

What does Make solid do? It just changes “CAD” lines and dots into meshes, creating triangles.  

A mesh can be more or less thick, according to the MB filled. 

Now, click on the Edit menu > MAke Solid.
Let’s set the following parameters:
Sold Type: Fast
Color Transfer MOde: Automatic
Solid Accuracy: 30
Mesh Density: 15

Click on Update to adopt the parameters. It’s not until you click on Accept that the changes actually affect the item.

Let’s change the parameters as follows:
Solid Type: Accurate;
Color Transfer Mode: Vertex-To-Vertex;
Solid Accuracy: 190;
Mesh Density:150;

The higher the Make Solid values are, the better the resolution will be.
Please, notice this object has a higher resolution, especially in the right down corner of the following picture.

Obviously, it’ll weigh a lot more than the previous file. This is exactly why a 3D scan is that heavy on MB.
The Make Solid function gives back a heavier 3D object. However, this function simplifies the geometries, it creates lines and dots. This way, there are no more curves.

To manage the 3D model mesh, it takes a 3D modeling program that allows you to model organically. For example, Z-Brush or MeshMixer
These kinds of software reshape and move the object thanks to brushes.

This program, stephaneginier.com, will surely help you understand what is the organic 3D modeling and how to handle the mesh with brushes.

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